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Formula: AgPb(Sb,Bi)3S6
Sulphosalt, lillianite homologous series group,
antimony- and bismuth-
bearing mineral
Crystal System: Monoclinic
Specific gravity: 6.005 calculated
Hardness: 4
Streak: Black
Colour: Black
Environments
Terrywallaceite is a relatively new mineral, approved in 2011.
Localities
At the type locality, Level 390, Vein 14, Herminia Mine, Julcani District, Angaraes Province, Huancavelica, Peru,
terrywallaceite was found on a rock sample associated with
tetrahedrite, gustavite,
baryte and pyrite. Hydrothermal
alteration and mineralisation are believed to have taken place concurrently with the intrusion of late-stage
volcanic domes and dikes.
Terrywallaceite crystals are lath-shaped, opaque, black, with a metallic lustre and with striations parallel
to the elongated direction; they are up to 0.5 mm long
(AM 98.7.1310-1314).
Terrywallaceite from the Herminia Mine -
Image
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