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Formula: Ag7As5+S6
Sulphosalt, arsenic-bearing mineral
Crystal System: Isometric
Specific gravity: 5.92 measured, 5.90 calculated
Hardness: 2½
Colour: Dark lead-grey
Common impurities: Cu,Fe
Environments
Sedimentary environments
Hydrothermal environments
Localities
At the type locality, the North Lily Mine, East Tintic Mining District, Utah County, Utah, USA, billingsleyite
is believed to have occurred in a body of high-grade silver ore containing
acanthite, tennantite,
bismuthinite,
pyrite and galena in
shale. Billingsleyite occurs as fine grained aggregates with a
dark lead-gray colour and a metallic lustre
(AM 53.1791-1798, HOM).
Billingsleyite from the North Lily Mine -
Image
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