Betekhtinite

minerals

bornite

chalcocite

chalcopyrite

Formula: (Cu,Fe)21Pb2S15
Sulphide
Specific gravity: 5.96 to 6.05
Hardness: 3 to 3½
Streak: Black
Colour: Black
Common impurities: Ag
Environments:

Sedimentary environments
Hydrothermal environments

Betekhtinite occurs associated with bornite, chalcocite, chalcopyrite, galena, silver, celestine, anhydrite and calcite (HOM).

Localities:

There are two co-type localities:
the Fortschritt shaft I, Volkstedt, Eisleben, Mansfeld-Südharz, Saxony-Anhalt, Germany
and
the Ernst Thälmann Shaft, Hübitz, Siersleben, Gerbstedt, Mansfeld-Südharz, Saxony-Anhalt, Germany

At these localities betekhtinite occurs in veins cutting the Mansfeld copper shale. It occurs in irregular masses cut by bornite, chalcopyrite and galena, and as pure needles associated with calcite, mostly a few tenths of a mm in diameter. Some needles have overgrowths of native silver (AM 41.371-372). Associated minerals include silver, galena, chalcopyrite, chalcocite, celestine, bornite and anhydrite (Mindat).

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