Selenopolybasite
Selenopolybasite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Cu(Ag,Cu)₆Ag₉Sb₂(S,Se)₉Se₂.
It crystallizes in the hexagonal crystal system (space group P-3m1).
Key properties: Mohs hardness 3–3.5; specific gravity 6.548; Black streak; Metallic. Bireflectance: Weak to moderate. Anisotropic luster.
IMA symbol Splb, IMA status: approved, named in 2006.
Found in silicious veins through rhyolite porphyry altered at shallow depth by heated brines.
It is found associated with Naumannite, covellite, pyrite, calcite.
The selenium 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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