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Mineralpedia Details for Cosalite

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Cosalite

Cosalite

Named for the type locality at the Cosala mine near the town of Cosala in the municipality of Cosala in Sinaloa, Mexico. It is an uncommon mineral that occurs in medium-temperature hydrothermal deposits and in contact metasomatic and epithermal replacements, and in pegmatites.  Localities for Cosalite include in, additionally, the United States, Canada, the Czech Republic, Sweden, Kazakhstan, England, Romania, Australia, and Madagascar, among a few others.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/cosalite.pdf

Formula
Pb2Bi2S5 
Crystal System
Orthorhombic 
Crystal Habit
Radial, Massive - Fibrous 
Cleavage
Good, None, None 
Luster
Metallic 
Color
gray, steel gray, silver white 
Streak
black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
2.5-3 
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Cosalite from Homestake mine, Lawrence Co., South Dakota, United States

Cosalite
            from Homestake mine, Lawrence Co., South Dakota, United States

Small acicluar Cosalite crystals, less than 1mm.

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Cosalite from Kara-Oba W deposit, Betpakdala Desert, Karagandy, Kazakhstan

Cosalite
            from Kara-Oba W deposit, Betpakdala Desert, Karagandy, Kazakhstan

An combination specimen of Mostly large cubic Pyrite crystals to 1cm and needle-like crytsals of Cosalite. Also in association is a large black Sphalerite crystals and micro octahedral crystals of purple Fluorite and Muscovite.

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Cosalite from Bolivar mine, Piedras Verdes, Chihuahua, Mexico

Cosalite
            from Bolivar mine, Piedras Verdes, Chihuahua, Mexico

There are numerous places on this specimen with acicular or thin elongated blades of Cosalite in open spaces in Calcite and Chalcopyrite. Very attractive specimen with the golden Chalcopyrite crystals (6-11mm), Quartz crystals and Calcite.

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