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