Krupkaite

krupkaite

gladite

bismuthinite

aikinite

Images

Formula: PbCuBi3S6
Sulphosalt, member of the aikinite-bismuthinite series, bismuth-bearing mineral
Specific gravity: 6.98 calculated
Hardness: 3½ to 4
Streak: Black
Colour: Steel-grey
Common impurities: Se
Environments

Hydrothermal environments

Krupkaite occurs rarely in hydrothermal veins. Associated minerals include gladite, bismuthinite, aikinite, bismuth, cassiterite and quartz (HOM).

Localities

At the type locality, the Barbora adit, Knöttel area, Krupka, Teplice District, Ústí nad Labem Region, Czech Republic, krupkaite occurs as fibrous dark steel-grey aggregates in parallel intergrowth with bismuthinite at the molybdenite-feldspar deposit (AM 60.737), in a vein between gneiss and an orthoclase pegmatite intergrown with bismuthinite (Webmin). Associated minerals include gladite, bismuthinite, aikinite, bismuth, cassiterite and quartz (Mindat).

Back to Minerals