Miargyrite

sulfosalt

baumstarkite

Formula: AgSbS2
Sulfosalt
Specific gravity: 5.25
Hardness: 2½
Streak: Cherry red
Colour: Black with dark red internal reflections
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.

At the Eldorado mine, Ouray county, Colorado, USA, miargyrite is associated with polybasite, pyrargyrite and tetrahedrite.

Common impurities: As,Fe

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