TFR1AO8: Very aerial Stibiconite pseudomorph after a Stibnite crystal, with perfectly defined crystal forms and excellent terminations. On matrix, covered by pale pink scalenohedra of Calcite.
Real de Catorce (Catorce), Catorce Mountains, Municipio Catorce, San Luis Potosí  Mexico

Specimen size: 15 × 9.1 × 5 cm = 5.91” × 3.58” × 1.97”

Main crystal size: 10 × 1.8 cm = 3.94” × 0.71”

MD87AH7: Stibiconite pseudomorph after a previous Stibnite crystal with an elongated prismatic shape, with a double termination and partially coated by small Calcite crystals. Because the definitive species designation is still under discussion, we prefer to use the classic name Stibiconite for these samples, a Mexican classic.
Real de Catorce (Catorce), Catorce Mountains, Municipio Catorce, San Luis Potosí  Mexico

Specimen size: 19 × 2 × 1.4 cm = 7.48” × 0.79” × 0.55”

EM49F4: Two pseudomorphic crystals of Stibiconite after Stibnite, very large, prismatic, and perfect. As is normal in the examples from Mexico, Stibiconite has completely replaced the Stibnite, not just coated it.
Real de Catorce (Catorce), Catorce Mountains, Municipio Catorce, San Luis Potosí  Mexico (±1970)

Specimen size: 19 × 5 × 6 cm = 7.48” × 1.97” × 2.36”

TR10Q8: Group of sharp crystals, pseudomorphous after Stibnite, with very well defined faces and edges. The locality is considered typical for the species.
It is noted as a donation of A.B. Stiles to the Mineralogical Museum of the University of Delaware.
Real de Catorce (Catorce), Catorce Mountains, Municipio Catorce, San Luis Potosí  Mexico

Specimen size: 23 × 5 × 5 cm = 9.06” × 1.97” × 1.97”

Main crystal size: 22 × 3.6 cm = 8.66” × 1.42”

CMP87CD5: Botryoidal aggregates of the “wood tin” variety of Cassiterite, with a bright yellow-orange color and concentric growths, as can be seen on the sides of the piece.
This specimen comes from the collection of duplicates of Carles Curto (number 1967.12) whose digital catalogue entry and handwritten label we will send to the buyer.
Santa María del Oro, Municipio Charcas, San Luis Potosí  Mexico

Specimen size: 5.4 × 4.5 × 2 cm = 2.13” × 1.77” × 0.79”

EG46Y8: Doubly terminated crystals of Fluor-Buergerite on matrix. They show a combination of a dominant ditrigonal prism and rhombohedral terminations. The crystals are very bright, have dark a brown, almost black, color with translucent reflections. The sample, from the type locality for the species, is with a label from John. S. White that indicates it previously was in the Luther Thomas collection. We’ll send both labels to the buyer.
The specimen has been photographed and published in the magazine ‘Paragénesis’, number 01/2020, page 62
Municipio Mexquitic de Carmona, San Luis Potosí  Mexico

Specimen size: 6.6 × 5.4 × 3 cm = 2.60” × 2.13” × 1.18”

Main crystal size: 0.8 × 0.5 cm = 0.31” × 0.20”

DA66AI7: Group of Topaz crystals on a matrix of volcanic rock. They have very well defined faces and edges and pinacoidal terminations and they are transparent, bright and have color zoning, deeper and more concentrated in the terminal areas. A Mexican classic. The sample is from the Daunis collection whose label we’ll send to the buyer.
Tepetate, Villa de Arriaga Municipality, San Luis Potosí  Mexico

Specimen size: 3.2 × 2.4 × 2.1 cm = 1.26” × 0.94” × 0.83”

Main crystal size: 0.9 × 0.5 cm = 0.35” × 0.20”

MC26V1: Doubly terminated crystal on matrix. It has well-defined faces and edges and is transparent, with a very deep color. It also has a small aggregate of Opal (variety hyalite) near its upper termination.

Tepetate belongs to the Villa de Arriaga pegmatitic–rhyolitic field, characterized by miarolitic cavities developed in Cenozoic rhyolitic and granitic rocks. These cavities have yielded well-formed Topaz crystals, often associated with Opal and other late pneumatolytic minerals related to fluorine-rich fluids.
Tepetate, Villa de Arriaga Municipality, San Luis Potosí  Mexico

Specimen size: 3.4 × 3.1 × 2.1 cm = 1.34” × 1.22” × 0.83”

Main crystal size: 2.2 × 0.6 cm = 0.87” × 0.24”

MC13AM7: Group of Datolite crystals with sharp crystal forms, translucent, with good luster and a pale green color and bordered by a second generation of small, very transparent and lustrous white crystals of Calcite. A Mexican classic that we will send in its original Perky box from the Robert J. (Bob) Noble collection, which also contains the label.
Charcas, Municipio Charcas, San Luis Potosí  Mexico

Specimen size: 2.4 × 2.3 × 2.2 cm = 0.94” × 0.91” × 0.87”

Main crystal size: 1.3 × 1.2 cm = 0.51” × 0.47”

TH14AN2: Two very sharp Danburite crystals, with excellent terminations, completely water-clear and very lustrous.
We will send the specimen, from one of the great classic Mexican localities, in its original Perky box from the Robert J. Noble collection, which also contains the label.
Charcas, Municipio Charcas, San Luis Potosí  Mexico

Specimen size: 3.1 × 1.9 × 1 cm = 1.22” × 0.75” × 0.39”

Main crystal size: 3.1 × 1 cm = 1.22” × 0.39”

EFR49CD4: Group of Borcarite crystals on matrix. This species is a curious combination of borate and carbonate - hence its name - with calcium and magnesium, of a delicate bottle-green color, with crystals that are among the sharpest and best developed known for the species, translucent and very lustrous.
A high quality specimen for the species.
San Bartolo Mine, Charcas, Municipio Charcas, San Luis Potosí  Mexico

Specimen size: 4 × 2 × 1.3 cm = 1.57” × 0.79” × 0.51”

Main crystal size: 0.2 × 0.1 cm = 0.08” × 0.04”

NFN72XXX: Group of extraordinarily transparent, brilliant and well-defined Nifontovite crystals, with elongated prismatic habit and well-developed terminations. Particularly remarkable is the optical purity of the crystals, uncommon for the species, as well as the elegant parallel arrangement of the growth and their good state of preservation.
These Nifontovites, found between 2025 and 2026, represent, because of their transparency, a clear improvement in quality compared to specimens previously recovered from the same locality.
Nifontovite is a rare hydrated borate formed in boron-rich environments associated with highly specialized parageneses.

Rey y Reina is a mine from the Charcas mining district, famous for its complex mineral associations and especially well known among collectors for its rare borates. The mineralization developed in a polymetallic hydrothermal setting hosted in carbonate rocks, where boron-rich metasomatic processes gave rise to an exceptional paragenesis of uncommon minerals.
Rey y Reina Mine, Charcas, Charcas Municipality, San Luis Potosí  Mexico (2025)

Specimen size: 4 × 2 × 1.8 cm = 1.57” × 0.79” × 0.71”

Main crystal size: 3.8 × 1  cm = 1.50” × 0.39”

EY7V0: Aggregate of tabular crystals (poker chip habit) with hexagonal shape and triangular growth forms on the pinacoid. They have a very well defined color zoning, white on the terminations and creamy in the center.
San Bartolo Mine, Charcas, Municipio Charcas, San Luis Potosí  Mexico (1970-1980)

Specimen size: 12.6 × 7.8 × 4.6 cm = 4.96” × 3.07” × 1.81”

Main crystal size: 3.6 × 2.6 cm = 1.42” × 1.02”

ER96I1: The crystals of Danburite are completely clear and form a contact visible both for the form of wedge on the termination and the fine suture all along the prism. The group is densely covered by amethyst crystals of excellent color.
The specimen has been reviewed, photographed and published as a new discovery in the magazine ‘Mineral Up’ on page 28 in number 2006/2.
Mina San Bartolo, Charcas, San Luis Potosí  Mexico (2005-2006)

Specimen size: 4 × 2.8 × 3 cm = 1.57” × 1.10” × 1.18”

Main crystal size: 1.5 × 0.6 cm = 0.59” × 0.24”

EL30H7: The sample is very esthetic, formed by prismatic crystals of Danburite, one of them clearly dominant, with very sharp faces and edges and clear terminations. On the base of the specimen there are groups of amethyst Quartz of a nice color, contrasting with the white Danburite.
This sample has been reviewed, photographed and published as news from Ste. Marie 2006 by the magazine ‘Le Règne Minéral’ on page 47, number 70.
Mina San Bartolo, Charcas, San Luis Potosí  Mexico (2005-2006)

Specimen size: 7 × 6.5 × 4.5 cm = 2.76” × 2.56” × 1.77”

Main crystal size: 8.3 × 2.2 cm = 3.27” × 0.87”

TB16G9: We specially love the vivid green color of his fine and esthetic botryoidal growth, really formed of crystals with completely rounded faces and edges.
Mina Santa Anita, Choix, Sinaloa  Mexico (2005)

Specimen size: 5.5 × 5 × 2.5 cm = 2.17” × 1.97” × 0.98”

TJA28AN6: Very sharp crystals of Olivenite on matrix, flattened, some of them doubly terminated, with very well defined faces and edges and perfect terminations, with bright luster and a very deep olive-green color. As on so many other occasions in Milpillas, one of the best for the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 1.7 × 1.1 × 0.9 cm = 0.67” × 0.43” × 0.35”

Main crystal size: 1 × 0.2 cm = 0.39” × 0.08”

TA50AL2: A novelty at Tucson 2020. Two outstanding Olivenite crystals, one of them clearly dominant, flattened, with very well defined faces and edges and perfect terminations, lustrous and very deep olive green. As on so many other occasions in Milpillas, among the best of the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 1.8 × 0.9 × 0.6 cm = 0.71” × 0.35” × 0.24”

TT49AL2: A novelty at Tucson 2020. Matrix group of outstanding Olivenite crystals, one of them clearly dominant, flattened, with very well defined faces and edges and perfect terminal faces, lustrous and very deep olive green. As on so many other occasions in Milpillas, among the best of the species.
The sample has been noted and photographed in the monograph 'The Milpillas Mine' of the ‘Mineralogical Record‘ magazine on page 608 in the volume 52, number 5, September-October 2021 and in the Russian magazine ‘Mineral Observer’ on page 58 in the volume 25, number 2

Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 1.9 × 1.4 × 1.3 cm = 0.75” × 0.55” × 0.51”

Main crystal size: 1.9 × 0.5 cm = 0.75” × 0.20”

TX99AL2: A novelty at Tucson 2020. Two outstanding Olivenite crystals, flattened, with sharp faces and edges and perfect terminal faces, lustrous and very deep olive green. As on so many other occasions in Milpillas, the best for the species. As on so many other occasions in Milpillas, among the best of the species.
The specimen has been reviewed, photographed and published as a novelty from Tucson 2020 in the Russian magazine ‘Mineral Observer’ on page 58 in the volume 25, number 2

Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 1.9 × 1.8 × 0.9 cm = 0.75” × 0.71” × 0.35”

Main crystal size: 1.9 × 0.7 cm = 0.75” × 0.28”

TV99AL2: A novelty at Tucson 2020. Group, on matrix, of highly profiled, flattened Olivenite crystals, some of them doubly terminated, with very well defined faces and edges and perfect terminal faces, lustrous and very deep olive green. As on so many other occasions in Milpillas, among the best of the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 2 × 1.6 × 1.2 cm = 0.79” × 0.63” × 0.47”

Main crystal size: 1.8 × 0.5 cm = 0.71” × 0.20”

TD88AM3: A novelty at Tucson 2020. Group of Olivenite crystals on matrix, one of them clearly dominant and very aerial and sharp, flattened, with very well defined faces and edges and perfect terminations. With good luster and a very deep olive-green color. As on so many other occasions in Milpillas, among the best for the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 2.2 × 1.4 × 0.8 cm = 0.87” × 0.55” × 0.31”

Main crystal size: 1.1 × 0.3 cm = 0.43” × 0.12”

TC47AM3: A novelty at Tucson 2020. Group of Olivenite crystals on matrix, one of them clearly dominant and very aerial and sharp, flattened, with very well defined faces and edges and perfect terminations. With good luster and a very deep olive-green color. As on so many other occasions in Milpillas, among the best for the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 2.2 × 1.9 × 1.7 cm = 0.87” × 0.75” × 0.67”

Main crystal size: 1.2 × 0.4 cm = 0.47” × 0.16”

TF49AM0: A novelty at Tucson 2020. Very aerial group of sharp, flat, doubly terminated Olivenite crystals on matrix. With very well defined faces and edges and perfect terminations, lustrous and very deep olive green. As with so many other things from Milpillas, among the best for the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 2.5 × 1.9 × 0.6 cm = 0.98” × 0.75” × 0.24”

Main crystal size: 1 × 0.2 cm = 0.39” × 0.08”

TR92AL2: A novelty at Tucson 2020. Very aerial group, on matrix, of highly profiled, flattened, doubly terminated Olivenite crystals, with sharp faces and edges and perfect terminal faces, lustrous and with a very deep olive-green color. As on so many other occasions in Milpillas, among the best of the species.
The specimen has been reviewed, photographed and published as a new discovery in the magazine ‘Mineral Up’ on page 43 of the 2020/02 edition.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 3.3 × 2.6 × 2 cm = 1.30” × 1.02” × 0.79”

Main crystal size: 1.9 × 0.3 cm = 0.75” × 0.12”

TXX88AP9: Very sharp Olivenite crystals on matrix, flattened, some of them doubly terminated, with the faces and edges well defined, translucent, shiny and of a very deep olive-green color.
As on so many other occasions in Milpillas, the best for the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 3.7 × 2.7 × 1.9 cm = 1.46” × 1.06” × 0.75”

Main crystal size: 1.1 × 0.2 cm = 0.43” × 0.08”

TY90AM0: A novelty at Tucson 2020. Isolated crystals of Olivenite on matrix, flat and most of them doubly terminated. With very well defined faces and edges and perfect terminal faces, lustrous and very deep olive green. As with so many things from Milpillas, among the best for the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 4.5 × 4.2 × 3.2 cm = 1.77” × 1.65” × 1.26”

Main crystal size: 1.2 × 0.2 cm = 0.47” × 0.08”

TT51AL2: A novelty at Tucson 2020. Matrix group of acicular Olivenite crystals with very well defined faces and edges, lustrous and very deep olive green. As on so many other occasions in Milpillas, among the best of the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 4.7 × 3 × 1.9 cm = 1.85” × 1.18” × 0.75”

Main crystal size: 0.4 × 0.1 cm = 0.16” × 0.04”

TT96AL9: A novelty at Tucson 2020. Druse of elongated Olivenite crystals on matrix with sharp faces and edges and good terminal faces, with good luster and a very deep olive green color. As with so many other finds fromn Milpillas, among the best for the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 7.2 × 5.5 × 1.6 cm = 2.83” × 2.17” × 0.63”

Main crystal size: 0.6 × 0.1 cm = 0.24” × 0.04”

TV87AL2: A novelty at Tucson 2020. Matrix group of acicular Olivenite crystals with very well defined faces and edges, lustrous and very deep olive green. As on so many other occasions in Milpillas, among the best of the species.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 7.7 × 6.6 × 2.4 cm = 3.03” × 2.60” × 0.94”

Main crystal size: 1.1 × 0.1 cm = 0.43” × 0.04”

TR48AL5: A novelty at Tucson 2020
Groups of very sharp Olivenite crystals, many of them doubly terminated, with very well-defined faces and edges and perfect terminal faces. The crystals are transparent to translucent, lustrous, and have a very deep olive-green color. They are set on a Quartz-rich matrix partially coated by small yellowish-white botryoidal aggregates of Hydroniumjarosite.
As on so many other occasions at Milpillas, these Olivenites are among the best known for the species.
This sample has been referenced and pictured, as a novelty in Ste. Marie Virtual 2020, in the magazine 'Le Règne Minéral' number 154, page 45

The Milpillas deposit is a partially oxidized porphyry copper system belonging to the Laramide copper belt of northern Sonora. A particularly well-developed supergene profile formed above the primary Chalcopyrite-Bornite mineralization, producing successive zones of oxidation and secondary copper enrichment. This intense supergene alteration is responsible for the extraordinary diversity of secondary copper minerals for which Milpillas is famous, including these excellent Olivenite crystals.
Milpillas Mine, level 992, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2019)

Specimen size: 9.6 × 6.4 × 4 cm = 3.78” × 2.52” × 1.57”

Main crystal size: 1.4 × 0.3 cm = 0.55” × 0.12”

TT6Y4: Group of sharp doubly terminated crystals, one of them clearly dominant. They have the extraordinary deep blue color (“electric blue”) typical of the best samples from Milpillas and are slightly coated by Malachite. Nice miniature.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2011-2012)

Specimen size: 2 × 1.5 × 0.7 cm = 0.79” × 0.59” × 0.28”

Main crystal size: 2 × 1.2 cm = 0.79” × 0.47”

TA68AJ2: A novelty at Tucson 2019. Very sharp Azurite crystals, one of them clearly dominant, with a morphology that is unusual until now at Milpillas. The crystals, on matrix, are extremely flattened, between translucent and transparent, extraordinarily bright and have a very deep color with vivid reflections.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (12/2018)

Specimen size: 2.4 × 2 × 1.1 cm = 0.94” × 0.79” × 0.43”

Main crystal size: 1.6 × 1.1 cm = 0.63” × 0.43”

TJ51AD0: Single Azurite crystal on matrix. It is doubly terminated, very rich in faces, very bright, and with the extraordinary deep blue color (electric blue) that has made the Azurites from this locality famous.
The specimen has been photographed and published in the magazine ‘Paragénesis’, number 01/2016, page 80
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (04/2015)

Specimen size: 3.2 × 2.7 × 1.5 cm = 1.26” × 1.06” × 0.59”

Main crystal size: 2.8 × 1.3 cm = 1.10” × 0.51”

DBX56AP9: Very aerial group of lenticular Azurite crystals. Brilliant and of a very lively color known as “electric blue”, and with a small matrix with growths of Malachite.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (12/2013)

Specimen size: 3.3 × 1.9 × 1.8 cm = 1.30” × 0.75” × 0.71”

Main crystal size: 1.8 × 1 cm = 0.71” × 0.39”

TT69AJ2: A novelty at Tucson 2019. Very sharp Azurite crystals with a morphology that is unusual until now at Milpillas. The crystals, on matrix, are very flattened, between translucent and transparent, extraordinarily bright and have a very deep color, with vivid reflections.
This specimen was published on the Mineralogical Record´s web page, in the ‘What's New’ section, report 52, April 13, 2019 edition, page 5
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (12/2018)

Specimen size: 3.3 × 2.8 × 1.9 cm = 1.30” × 1.10” × 0.75”

Main crystal size: 1.8 × 1 cm = 0.71” × 0.39”

HM190NJ: Floater growth of sharp Azurite crystals with very well defined faces and edges, translucent and with the extraordinary deep blue color (“electric blue”) typical of the best specimens from Milpillas. With vivid internal reflections and transparent parts under intense light and with coatings of acicular Malachite crystals.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2012)

Specimen size: 3.6 × 2.8 × 1.7 cm = 1.42” × 1.10” × 0.67”

TB69AF1: Flattened Azurite crystals that are very aerial on the matrix, with very well defined faces and edges and having the brilliant luster and famous rich blue color (“electric blue”) typical of the best samples from Milpillas. With small fibrous Malachite coatings.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2015)

Specimen size: 3.7 × 3.3 × 2.1 cm = 1.46” × 1.30” × 0.83”

Main crystal size: 2.3 × 1 cm = 0.91” × 0.39”

EB63Q8: A novelty at Ste. Marie 2010. Two individualized sharp doubly terminated crystals on matrix of very well defined faces and edges and having the very intense luster from Milpillas. Their incredible blue color (“electric blue”) is typical of the samples of this very special find.
This specimen was photographed and published as a novelty at the 2010 Ste. Marie Show in the magazine ‘Le Règne Minéral’ number 94, page 57, for the magazine ‘Mineralien Welt’ page 11 of number 5/2010 and for the magazine ‘Mineral Up’ on page 29 in number 2010/2 as well as in the special "Milpillas" of the "Lapis" magazine number 07-08/2017, page 4
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (05/2010)

Specimen size: 3.8 × 3.4 × 2.4 cm = 1.50” × 1.34” × 0.94”

Main crystal size: 3 × 1.3 cm = 1.18” × 0.51”

TP94AK6: Very aerial group of complex crystals, some of them doubly terminated, with well defined faces and edges, translucent and with the extraordinary deep blue color (“electric blue”) typical of the best specimens from Milpillas, with bright reflections and transparency under intense light. On matrix, with Malachite and small Baryte crystals.
Milpillas Mine, level 1140, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2010)

Specimen size: 4.2 × 2.6 × 2.7 cm = 1.65” × 1.02” × 1.06”

Main crystal size: 2 × 2 cm = 0.79” × 0.79”

TA99W9: Very aerial group of complex crystals that have very well defined faces and edges. They are translucent and have an extraordinary deep blue color (electric blue) typical of the best samples from Milpillas. They have vivid reflections and transparencies under a strong light.
Milpillas Mine, level 1100, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (10/2011)

Specimen size: 4.4 × 2.8 × 2.2 cm = 1.73” × 1.10” × 0.87”

Main crystal size: 1.2 × 1 cm = 0.47” × 0.39”

TB47AL5: Floater group of highly profiled, flattened crystals with very well defined faces and edges, with an equidimensional habit, bright, and very deep in color with intense and vivid translucency on the edges. As usually happens in the Milpillas mine, of extraordinary quality, especially due to the sharpness of the crystals.
Milpillas Mine, level 1100, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (01/2020)

Specimen size: 4,6 × 3.4 × 1 cm = 1.57” × 1.34” × 0.39”

Main crystal size: 3.4 × 2.3 cm = 1.34” × 0.91”

TC2480TEP: Group of thick lenticular Azurite crystals, with very well defined faces and edges, with the intense luster of Milpillas and the famous deep blue color (“electric blue”) of the best specimens from this locality. It sits on matrix with small coatings of fibrous Malachite. The Milpillas mine was closed in June 2020
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2013)

Specimen size: 4.6 × 3.8 × 2.3 cm = 1.81” × 1.50” × 0.91”

Main crystal size: 2 × 1.6 cm = 0.79” × 0.63”

TP48AB4: Aggregate, on matrix, of complex Azurite crystals, with very well defined faces and edges and polycrystalline surfaces. The crystals have a deep and vivid blue color (“electric blue”), transparent on the edges and a very intense luster.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (12/2013)

Specimen size: 4.9 × 3.5 × 2.5 cm = 1.93” × 1.38” × 0.98”

Main crystal size: 1 × 0.8 cm = 0.39” × 0.31”

TD50Q0: Aggregate of equidimensional crystals of Azurite of very deep color and intense luster, on matrix with Malachite. Some faces show a beginning of altering to Malachite but they haven’t lost their luster.

Milpillas Mine, level 1100, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (08/2009)

Specimen size: 5.1 ×  3 × 2.8 cm = 2.01” × 1.18” × 1.10”

Main crystal size: 1.3 × 0.9 cm = 0.51” × 0.35”

TR71AE7: Very aerial aggregate, on matrix, of thick lenticular crystals with very well defined faces and edges, with slight curvatures and a very intense luster, with transparencies on the edges and the famous rich blue color (“electric blue”) typical of the best samples from Milpillas. The Azurite crystals are partially coated by balls of fibrous Malachite that has a silky luster.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2013)

Specimen size: 5 × 2.9 × 2.5 cm = 1.97” × 1.14” × 0.98”

Main crystal size: 2.4 × 1.4 cm = 0.94” × 0.55”

TC270TG: Very aerial group of complex Azurite crystals, with well defined faces and edges, translucent and with the extraordinary deep blue color (“electric blue”) typical of the best specimens from Milpillas. With vivid reflections and transparencies under intense light and coatings of acicular Malachite crystals.

Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (12/2013)

Specimen size: 5.1 × 3.5 × 2.4 cm = 2.01” × 1.38” × 0.94”

Main crystal size: 1.2 × 1.2 cm = 0.47” × 0.47”

TR98V4: Parallel aggregates of Azurite crystals with very well defined faces and edges, very bright and with a very deep color. They are on a base of fibrous crystals of Malachite.
Milpillas Mine, level 1100, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (05/2010)

Specimen size: 5.3 × 4.4 × 2.7 cm = 2.09” × 1.73” × 1.06”

Main crystal size: 1.7 × 1.6 cm = 0.67” × 0.63”

TD47V2: Esthetic group of sharp, flattened, crystals of Azurite with very well defined faces and edges. They are partially pseudomorphed by Malachite, but they conserve a lot of the pristine transparency and intensity of color of the Azurite.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2009)

Specimen size: 5.4 × 3.2 × 1.4 cm = 2.13” × 1.26” × 0.55”

Main crystal size: 4 × 2.1 cm = 1.57” × 0.83”

TZ64Z3: Very aerial aggregate of complex crystals with slightly curved faces, very bright, translucent and with a vivid, deep and uniform blue color. The sample is especially esthetic because it is crowning a matrix very rich in small acicular Malachite crystals.
This specimen has been reviewed and published in the special "Milpillas" of the magazine ‘Lapis’ number 07-08/2017, page 23
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2013)

Specimen size: 5.8 × 4.4 × 2.4 cm = 2.28” × 1.73” × 0.94”

Main crystal size: 1.2 × 1 cm = 0.47” × 0.39”

EH66Q8: A novelty at Ste. Marie 2010. Very aerial and esthetic group of very well defined faces and edges and having the very intense luster from Milpillas. Their incredible blue color (“electric blue”) is typical of the samples of this very special find. With Malachite growths and on matrix.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (05/2010)

Specimen size: 6 × 4.2 × 3.3 cm = 2.36” × 1.65” × 1.30”

Main crystal size: 3.4 × 2.4 cm = 1.34” × 0.94”

TJA71AN4: Aggregate, on matrix, of thick lenticular Azurite crystals with very well defined faces and edges, with the very intense luster of Milpillas specimens, and the famous deep blue color (“electric blue”) of the best specimens from the locality. With small coatings of fibrous Malachite. The Milpillas mine closed in June 2020.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2013)

Specimen size: 6.2 × 4 × 2 cm = 2.44” × 1.57” × 0.79”

Main crystal size: 2 × 1.2 cm = 0.79” × 0.47”

TP88AI8: Group of very well defined Azurite crystals with slightly curved faces and edges, bright with a very deep and vivid color and with small Malachite growths on the surfaces of the faces. Different from other Azurites at this locality.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico

Specimen size: 6.4 × 4.1 × 3.2 cm = 2.52” × 1.61” × 1.26”

TX66S0: Individual crystals of simple and very well defined forms. Two of the crystals are clearly dominant, bright and deep blue colored, with transparent edges. A very beautiful sample, with an uncommon presentation for the locality, where crystals usually are grouped.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2010)

Specimen size: 6.3 × 6 × 3.2 cm = 2.48” × 2.36” × 1.26”

Main crystal size: 2.2 × 1.4 cm = 0.87” × 0.55”

TB14Z2: Very aerial group of Azurite crystals on matrix, with aggregates of acicular Malachite crystals. The crystals, one of them clearly dominant, are translucent and have the vivid and deep blue color (“electric blue”) typical of the best samples from Milpillas.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (11-12/2013)

Specimen size: 6.7 × 4.9 × 1.7 cm = 2.64” × 1.93” × 0.67”

Main crystal size: 2 × 1.6 cm = 0.79” × 0.63”

TQ46AB3: A novelty at Tucson 2015
Aggregate of very sharp, thick tabular Azurite crystals of the habit known as ‘chewing gum’ because of their characteristic profile. The crystals are transparent, highly lustrous and display the deep ‘electric blue’ colour that characterizes the finest Milpillas specimens. They are implanted on a white Dickite coating covering the matrix.
This specimen has been photographed and published as a novelty at the 2015 Tucson Show in the magazine 'Lapis' number 03/2015, page 28 and in the monograph 'The Milpillas Mine' of the ‘Mineralogical Record‘ magazine on page 552 in the volume 52, number 5, September-October 2021

The Milpillas deposit is a partially oxidized porphyry copper deposit. The azurite crystallized in the supergene oxidation zone, where copper-rich solutions circulating through fractures and cavities produced some of the world's finest secondary copper mineral specimens.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2014)

Specimen size: 7 × 4.5 × 1.4 cm = 2.76” × 1.77” × 0.55”

Main crystal size: 1.2 × 0.4 cm = 0.47” × 0.16”

TE0W4: Thick tabular crystals of azurite on matrix. They are much more isolated than usual, are very bright and have the vivid blue color (electric blue) that has made the Azurites from this locality famous.
Milpillas Mine, level 1100, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (10/2011)

Specimen size: 7.4 × 5 × 3.4 cm = 2.91” × 1.97” × 1.34”

Main crystal size: 1.4 × 1.4 cm = 0.55” × 0.55”

TA10AE2: Aggregate of thick tabular crystals with very well defined faces and edges, small curvatures and a deep blue color (“electric blue”) typical of the best Milpillas samples, nearly transparent on the edges and an intense luster. The aggregate is partially coated by fibrous Malachite crystals with a silky luster. A sample of great character.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (09/2013)

Specimen size: 7.6 × 7.5 × 1.8 cm = 2.99” × 2.95” × 0.71”

Main crystal size: 2.2 × 1.1 cm = 0.87” × 0.43”

TG27AF8: Elongated, flattened and doubly terminated Azurite crystals, very rich in faces, extraordinarily bright with intense reflections and transparences under a bright light, and with the deep and vivid color (“electric blue”) typical of the best samples from Milpillas. The sample is of the best possible quality, both for the species and for the locality.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2015)

Specimen size: 9.2 × 6.6 × 4.1 cm = 3.62” × 2.60” × 1.61”

Main crystal size: 3.2 × 1.2 cm = 1.26” × 0.47”

TAX50CD4: Azurite crystals on matrix, grouped in aggregates forming rosettes of slightly curved but very sharp crystals. With excellent luster and the best deep 'electric blue' color so characteristic of the Milpillas mine in Mexico, which is now closed.
A specimen of very high quality in which the contrast between the white matrix and the blue Azurite crystals is even more highlighted by the presence of grass-green fibrous Malachite crystals.
It should be noted that the presentation of Azurite crystals as rosettes is not common in Milpillas.
Milpillas Mine, level 1280, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2016)

Specimen size: 9.7 × 6.6 × 3.2 cm = 3.82” × 2.60” × 1.26”

Main crystal size: 2.2 × 1.1 cm = 0.87” × 0.43”

TT27AI4: Aggregate of very sharp Azurite crystals, one of them clearly dominant. These crystals, between translucent and transparent, are very bright and have the extraordinarily deep and vivid blue color (“electric blue”) typical of the best samples from Milpillas and they are implanted on a rough Malachite band coating the matrix. The esthetic blue-green contrast between Azurite and Malachite is not too common at Milpillas.

Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (07-08/2014)

Specimen size: 9.9 × 6.7 × 4.2 cm = 3.90” × 2.64” × 1.65”

Main crystal size: 2.7 × 1.3 cm = 1.06” × 0.51”

TR96AH4: Very sharp flattened single translucent Azurite crystal with very well defined faces and edges, very bright with an extraordinary deep blue (electric blue) color typical of the best samples from Milpillas. The crystal is implanted on a rock matrix coated by acicular Brochantite crystals, rarely associated with Azurite.
Milpillas Mine, Milpillas (Cuitaca), Municipio Santa Cruz, Sonora  Mexico (2013)

Specimen size: 10.7 × 10.1 × 5.3 cm = 4.21” × 3.98” × 2.09”

Main crystal size: 2.3 × 1.2 cm = 0.91” × 0.47”