Analyzed polished section of Fe,Bi-rich cupropolybasite from the famous Norilsk deposit in Russia. Ex Vandenbroucke Museum collection from Waregem, Belgium — Photo: David Hospital · CC BY 4.0
Cupropolybasite
Cupropolybasite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula [Cu₆Sb₂S₇][Ag₉CuS₄].
It crystallizes in the hexagonal crystal system (space group P-3m1). It is a member of the Polybasite structural group.
Key properties: Mohs hardness 3–3.5; specific gravity 6.31; Black streak; Metallic luster.
IMA symbol Cplb, IMA status: approved, named in 2007.
Supergene, in a hydrothermal epithermal silver-gold deposit.
It is found associated with Silver, quartz.
The prefix, cupro, identifies the Cu-dominant analogue of polybasite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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