TM37AE9: Complex Pyrite crystal, very rich in faces, with a dominant octahedron, very bright and on matrix. A rarity at Milpillas, very interesting from a morphological point of view.
This specimen has been reviewed and published in the special "Milpillas" of the magazine ‘Lapis’ number 07-08/2017, page 35 and in the monograph 'The Milpillas Mine' of the ‘Mineralogical Record‘ magazine on page 612 in the volume 52, number 5, September-October 2021
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora  Mexico (04/2016)

Specimen size: 3.7 × 3.6 × 3 cm = 1.46” × 1.42” × 1.18”

Main crystal size: 3.1 × 2.2 cm = 1.22” × 0.87”