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Formula: CuPbBi11S18
Sulphosalt, bismuth-bearing mineral, a member of the
aikinite-bismuthinite series
Crystal System: Orthorhombic
Specific gravity: 6.8 calculated
Hardness: 2 to 3
Streak: Lead-grey
Colour: Lead-grey
Common impurities: Ag,Fe
Environments
Metamorphic environments
Hydrothermal environments
Localities
At the type locality, the Juno Mine, Tennant Creek, Barkly Region, Northern Territory, Australia, pekoite
occurs in magnetite pipes that cut
felsic sediments and pyroclastics; the pipes are probably
hydrothermal replacements associated with volcanism. Associated minerals include
gladite, junoite,
emplectite, magnetite and
chalcopyrite
(HOM).
At the Băiţa mining district, Nucet, Bihor County, Romania, pekoite is associated with
padĕraite, hammarite,
chalcopyrite, grossular and
andradite
(HOM).
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