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Cosalite Chalcopyrite Sphalerite & Quartz

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SCH67117

Cosalite Chalcopyrite Sphalerite & Quartz

Description Tabs

Description
Locality: 
Bolivar Mine, Piedras Verde, Urique Municipality, Chihuahua, Mexico
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.3 × 5 × 5.3 cm
Description

A specimen of elongated prims richly scattered over quartz crystals. A large chalcopyrite twin is at the top with smaller groups present over the matrix. An epitaxial sphalerite is at one chalcopyrite side. The rare lead bismuth sulfide, cosalite, is found throughout most of the specimen. Both as tightly packed groups of acicular crystals, and wispy free standing hairs.

Mineral Data
What's on the rock

Cosalite

Formula: 
Pb2Bi2S5
Strunz: 
2.JB.10
Hardness: 
2.5 - 3.0
Colour: 
Grey
Streak: 
Black
Type Locality: 
Cosalá Mine, Cosalá, Mun. de Cosalá, Sinaloa, Mexico

Chalcopyrite

Formula: 
CuFeS2
Strunz: 
2.CB.10a
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0

Sphalerite

Formula: 
ZnS
Strunz: 
2.CB.05a
Crystal System: 
Isometric
Hardness: 
3.5 - 4.0

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White
schani

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