Polkovicite
Polkovicite is an IMA-recognized mineral species in the sulfide class, with the chemical formula (Fe,Pb)₃(Ge,Fe)₁₋ₓS₄.
It is a member of the Sphalerite, Germanite structural group.
Key properties: Dark gray. Anisotropism: Distinct. R1-R2: (470) 43.5-44.5 streak.
IMA symbol Pk, IMA status: approved, named in 1974.
Found in epigenetic veinlets and metasomatic replacement zones replacing sandstone and older sulfides, in brecciated sandstones underlying copper-bearing shales.
It is found associated with Marcasite, chalcopyrite, bornite, chalcocite, tennantite, sphalerite, galena.
The name refers to the Polkovice mine, Poland. Type Material: Jagellonian University, Krakow, Poland.
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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