Stephanite

stephanite

proustite

acanthite

tetrahedrite

Images

Formula: Ag5SbS4
Sulphosalt
Specific gravity: 6.2 - 6.3
Hardness: 2½
Streak: Shiny black
Colour: Lead grey, iron black
Solubility: Insoluble in water, hydrochloric and sulphuric acid; soluble in nitric acid if heated
Stephanite is stable below 197oC (Mindat)
Common impurities: As,Cu,Fe
Environments:

Hydrothermal environments

Stephanite is a late stage primary mineral in epithermal (low temperature) hydrothermal silver veins (Webmin, HOM). Associated minerals include proustite, acanthite, silver, tetrahedrite, galena, sphalerite and pyrite (HOM).

The type locality is Freiberg, Mittelsachsen, Saxony, Germany.

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