Oscarkempffite
Oscarkempffite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₁₀Pb₄(Sb₁₇Bi₉)S₄₈.
It crystallizes in the orthorhombic crystal system (space group Pnca). It is a member of the Lillianite structural group.
Key properties: Mohs hardness 3–3.5; specific gravity 5.8; Dark gray streak; Metallic luster.
IMA symbol Okp, IMA status: approved, named in 2011.
Found in a hydrothermal Ag-Sn vein deposit in strongly-altered dacitic volcanic rocks.
It is found associated with Aramayoite, stannite, miargyrite, pyrargyrite, tetrahedrite.
The mineral was named to honor Oscar Kempff Bacigalupo (b.1948), Bolivian mineralogist and economic geologist, who discovered several large mineral deposits in Bolivia (e.g.
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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