minerals

sphalerite

selenium

clausthalite

Tiemannite

Formula: HgSe
Selenide, sphalerite group, forms a series with metacinnabar. Selenium mineral.
Specific gravity:
Hardness: 2½
Streak: Greyish black
Colour: Steel-grey to black
Environments

Hydrothermal environments

Tiemannite is found in hydrothermal veins associated with the selenides clausthalite, eucairite, naumannite, klockmannite and umangite, and also metacinnabar, galena, sphalerite, baryte, manganese oxides and calcite (HOM).

Localities

At the type locality, St Lorenz Mine, Burgstatt veins, Clausthal-Zellerfeld, Goslar, Lower Saxony, Germany, massive tiemannite is separated from chalcopyrite by a calcite vein (AM 35.337-364).

Common impurities: Cd,S,Pb

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