Stephanite

sulfosalt

hydrothermal

Formula: Ag5SbS4 sulfosalt
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
Environments:

Hydrothermal environments

Stephanite is a late stage primary mineral in epithermal (low temperature) hydrothermal silver veins.

Common impurities: As,Cu,Fe

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