Miargyrite

minerals

pyrargyrite

tetrahedrite

baumstarkite

Images
Formula: AgSbS₂
Sulphosalt
Crystal System: Monoclinic
Specific gravity: 5.25 measured, 5.29 calculated
Hardness: 2½
Streak: Cherry red
Colour: Black with dark red internal reflections
Common impurities: As,Fe
Environments:

Hydrothermal environments

Miargyrite occurs in hydrothermal veins of low-temperature origin, associated with baumstarkite, proustite, pyrargyrite, polybasite, native silver, galena, sphalerite, pyrite, quartz, calcite and baryte (HOM).

Localities

At the Van silver mine, British Columbia, Canada, miargyrite occurs as crystals to 5 mm, generally associated with galena. Miargyrite is one of the earliest minerals to form, and is commonly overgrown by diaphorite and later minerals (Minrec 31.3.225).

At the Eldorado mine, Ouray county, Colorado, USA, miargyrite is associated with polybasite, pyrargyrite and tetrahedrite (R&M 84.5.423)

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