Naumannite

minerals

clausthalite

aguilarite

tiemannite

Formula: Ag2Se
Selenide
Specific gravity: 7.0 to 8.0
Hardness: 2½
Streak: Black
Colour: Grey-black
Stable below 133oC (AM 56.1882-1888)
Environments

Hydrothermal environments

Naumannite occurs in hydrothermal veins deficient in sulphur, associated with other selenides, quartz, and carbonates (Webmin, HOM). Associated minerals include clausthalite, aguilarite, acanthite, tiemannite, umangite, eucairite, argentian tetrahedrite, argentian gold, pyrite and chalcopyrite (HOM).

Localities

The type locality is Tilkerode, Harz, Saxony-Anhalt, Germany.

Common impurities: Pb,S

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