Billingsleyite
Billingsleyite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₇AsS₆.
It crystallizes in the cubic crystal system (space group P2_13).
Key properties: Mohs hardness 2.5; specific gravity 5.92; Metallic luster.
IMA symbol Bgy, IMA status: approved, named in 1967.
Believed to have occurred in a body of high-grade hydrothermal silver ore.
It is found associated with Acanthite, tennantite, bismuthinite, galena, pyrite.
The name refers to Paul Billingsley (1887-1962), mining geologist, who discovered the North Lily mine, and collected the type material.
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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