Polloneite
Polloneite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula AgPb₄₆As₂₆Sb₂₃S₁₂₀.
It crystallizes in the monoclinic crystal system (space group P2_1). It is a member of the Sartorite structural group.
Key properties: Mohs hardness 3–3.5; specific gravity 5.77; Black streak; Metallic. Anisotropism: Moderate in brown-violet and deep gray tints. Bireflectance: Moderate luster.
IMA symbol Plo, IMA status: approved, named in 2014.
Found in a hydrothermal vein barite-pyrite-(Pb-Zn-Ag) deposit.
It is found associated with Barite.
The name refers to the Pollone mine, where the mineral was discovered.
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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