Marcasite - Mineral specimens search results

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Mineral specimens search results for [ Marcasite ]

Floater aerial aggregate of small, extraordinarily lustrous Marcasite crystals with very sharp 'sperkise-type' twinning. The specimen comes from the prolific Bou Nahas Mine in Morocco, a polymetallic hydrothermal deposit developed along faults and fractures where a variety of sulphides have been deposited, including Marcasite.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (2020)
Specimen size: 5.6 × 4.5 × 2.9 cm = 2.20” × 1.77” × 1.14”

EQ14AM3: Marcasite

Floater aggregate of small Marcasite crystals with the twin law known as "sperkise", very sharp, and with extraordinary luster. This specimen clearly preserves cavities with the geometric shapes of vanished crystals, probably Baryte.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (2020)
Specimen size: 9.8 × 7.9 × 3.8 cm = 3.86” × 3.11” × 1.50”

TY16AN1: Marcasite

Parallel growths of sharp Marcasite crystals, clearly twinned, with bright luster, iridescent and in perfect condition. We will ship the specimen in its original Perky box from the Robert J. Noble collection, which also contains the label, which shows that it was previously in the Melanson collection.
Komořany (Most), Most District, Ústí nad Labem Region Czech Republic
Specimen size: 3 × 2 × 0.8 cm = 1.18” × 0.79” × 0.31”

MT66AI5: Marcasite

Very aerial floater group of sharp and flattened Marcasite crystals forming very well defined brass colored parallel growths that are extraordinarily bright.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (06/2018)
Specimen size: 7.8 × 3.2 × 2.1 cm = 3.07” × 1.26” × 0.83”

Main crystal size: 1 × 0.5 cm = 0.39” × 0.20”

JFD64AN9: Marcasite

The Bou Nahas mine exploded onto the world collecting scene relatively recently. This Marcasite is phenomenal, with a multitude of crystals, all with Sperkise twinning, which are grouped together forming a very sharp and aesthetic elongated column. Since the mine started operating not many years ago, it is not yet possible to know for certain how well these marcasites will be preserved, but at the moment they do not seem to show signs of decomposition. This piece was published in Lapis magazine, 03/2014, page 26, and in the book 'La Guide des Passionnés' by Julien Lebocey (Le Règne Minéral) on page 103
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (07/2014)
Specimen size: 14.4 × 2.3 × 2.1 cm = 5.67” × 0.91” × 0.83”

TY37AB2: Marcasite

A novelty at Tucson 2015. Very fine radiating growths of Marcasite crystals that are extraordinarily sharp, miter-shaped, very bright and are with small laminar and transparent Baryte crystals.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (07/2014)
Specimen size: 6 × 4.4 × 3.5 cm = 2.36” × 1.73” × 1.38”

MC64Y9: Marcasite

Very sharp "cockscomb” shaped Marcasite crystals with very well defined faces and edges. They are bright and are on a rocky matrix. The Marcasite crystals retain a very good condition despite more than a half century has passed since was collected from a locality that is rarely represented in mineral collections.
Christiane Mine, Adorf, Diemelsee, Waldeck-Frankenberg District, Hesse/Hessen Germany (±1950)
Specimen size: 7.5 × 4.5 × 3.7 cm = 2.95” × 1.77” × 1.46”

EG87AM6: Marcasite (Sperkise twinn) with Pyrite

Large very aerial aggregate of extraordinarily sharp Marcasite crystals, with the classic twin known as “sperkise” or “en miter”, very lustrous, with small Pyrite crystals.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (2020)
Specimen size: 20.1 × 12.7 × 9.9 cm = 7.91” × 5.00” × 3.90”

Main crystal size: 1.5 × 1 cm = 0.59” × 0.39”

JFD07AN5: Marcasite on Dolomite

Reocín Marcasite is dangerous because it tends to decompose relatively easily, especially in humid climates like Barcelona's. For some reason this piece has remained 'healthy' despite the many years it has resided in my collection. I do not know whether the Dolomite, pinker than usual in Reocín, has anything to do with its good preservation, but the fact is that here it is, resisting the passage of time quite nicely.
Reocín Mine, Reocín, Comarca Saja-Nansa, Cantabria Spain (±1985)
Specimen size: 5.4 × 4.3 × 3.7 cm = 2.13” × 1.69” × 1.46”

TC180EMX: Marcasite on Quartz

Group of very sharp Marcasite crystals, with sharp shiny twins, on a Quartz matrix.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (2018)
Specimen size: 13.4 × 9.8 × 3.7 cm = 5.28” × 3.86” × 1.46”

Main crystal size: 1.6 × 1.5 cm = 0.63” × 0.59”

JFD154AO7: Marcasite with Arsenopyrite and Calcite-Dolomite

A classic from Panasqueira: large sharp crystals of Marcasite, in 'cock's comb' habit, with some Arsenopyrite, and associated with carbonates (Calcite-Dolomite in this case) which very possibly contributes to making them more stable than those from other deposits.
Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region Portugal (1993)
Specimen size: 10.4 × 7.1 × 5.1 cm = 4.09” × 2.80” × 2.01”

EC96AG3: Marcasite with Barite, Pyrite and Quartz

Very aerial aggregate of very sharp Marcasite crystals that are bright, with very well defined faces and edges, and on Quartz matrix, with cubic Pyrite crystals and “book-like” aggregates of laminar and bright Baryte crystals.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (2016)
Specimen size: 11 × 5.7 × 8 cm = 4.33” × 2.24” × 3.15”

Main crystal size: 1.2 × 0.9 cm = 0.47” × 0.35”

CV13AH6: Marcasite with Calcite

Cookscomb-like aggregates of flattened Marcasite crystals with very well defined faces and edges. The Marcasite, even considering the long time passed, has been perfectly preserved.
Eugenia Mine, Bellmunt del Priorat, Comarca Priorat, Tarragona, Catalonia / Catalunya Spain
Specimen size: 3.2 × 3.2 × 2.2 cm = 1.26” × 1.26” × 0.87”

ST86AJ5: Marcasite with Calcite-Dolomite and Chalcopyrite

Very sharp “cockscomb-like” aggregates of Marcasite crystals that are very bright and on a matrix of massive Chalcopyrite with white growths of Calcite-Dolomite crystals.
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region Portugal
Specimen size: 11.2 × 7.8 × 3.6 cm = 4.41” × 3.07” × 1.42”

Main crystal size: 1.2 × 0.8 cm = 0.47” × 0.31”

EK67W2: Marcasite with Chalcopyrite

A novelty at St. Marie 2012. Very rich irregular aggregate of very flattened crystals of Marcasite that show, very well marked, the twin known as "cockscomb". They are extraordinarily bright, with small disphenoidal crystals of Chalcopyrite, and have skeletal forms, especially on the back side of the sample, that reveal holes left by former tabular crystals, probably Baryte.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (12/2011-01/2012)
Specimen size: 9.3 × 6.4 × 4.2 cm = 3.66” × 2.52” × 1.65”

TA57AH7: Marcasite with Pyrite and Calcite-Dolomite

Very sharp isolated Marcasite aggregates with the typical “cockscomb” shape. They have very well defined faces and edges and are implanted on a polycrystalline Fluorite growth with Siderite.
That sample from the Alain Martaud collection came from François Lietard (Minerive) and we will send both labels to the buyer.
Minas da Panasqueira, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region Portugal
Specimen size: 7.4 × 6.3 × 2.9 cm = 2.91” × 2.48” × 1.14”

Main crystal size: 1.8 × 1.7 cm = 0.71” × 0.67”

AN96M6: Marcasite with Pyrite, Arsenopyrite, Calcite and Dolomite

Group of twinned (this twin is known in German as “sperkise”) crystals of Marcasite, sharp, very well defined and bright, with groups of small cubic crystals of Pyrite and with Siderite and Calcite.
Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region Portugal (1998)
Specimen size: 6.4 × 4.8 × 2.7 cm = 2.52” × 1.89” × 1.06”

EX96AI7: Marcasite with Quartz

Very aerial rosette growths of very sharp and strongly flattened Marcasite crystals with extreme curving, intensely bright and on a Quartz matrix.
Bou Nahas Mine, Oumjrane mining area, Alnif Commune, Tinghir Province, Drâa-Tafilalet Region Morocco (04/2018)
Specimen size: 7 × 6.8 × 4.3 cm = 2.76” × 2.68” × 1.69”

JFD50AN8: Marcasite with Siderite and Muscovite

Marcasite is a mineral with a bad reputation since it is less stable than other iron sulphides, but the vast majority of Marcasites from Panasqueira are very stable since they are not usually pure marcasites but epitactic intergrowths of Arsenopyrite-Marcasite and that gives them great stability. This particularly elegant specimen is very well preserved despite the number of years I've had it and despite the fact that I live in a city with very high humidity, which does not help the conservation of sensitive species.
Minas da Panasqueira, level 0, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region Portugal (12/2014)
Specimen size: 7.2 × 5.4 × 3.1 cm = 2.83” × 2.13” × 1.22”

RF16M9: Marcasite-Arsenopyrite with Quartz and Siderite

Very well defined and bright "cockscomb" growths of Marcasite with Quartz crystals partially covered by small lenticular crystals of Siderite and with Pyrite.
Minas da Panasqueira, level 2, Aldeia de São Francisco de Assis, Covilhã, Castelo Branco, Cova da Beira, Centro Region Portugal (±1982)
Specimen size: 6.6 × 5.7 × 5 cm = 2.60” × 2.24” × 1.97”

Main crystal size: 2.8 × 2.2 cm = 1.10” × 0.87”

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