Formula: Ag3Sb3S6
Sulphosalt, the triclinic paramorph of monoclinic
miargyrite and isometric
cuboargyrite
Crystal System: Triclinic
Specific gravity: 5.33 measured, 5.39 calculated
Hardness: 2½
Streak: Greyish black
Colour: Greyish black to black
Environments
Localities
At the type locality, the San Genaro mine, Castrovirreyna District, Castrovirreyna Province, Huancavelica, Peru,
baumstarkite occurs as individual crystals not exceeding 3 mm and crystal aggregates up to 40x10mm coating
miargyrite in high-grade silver
ores of hydrothermal hypogene origin. Associated minerals
include
miargyrite, pyrargyrite,
stannite, kësterite,
andorite, diaphorite,
robinsonite, galena,
chalcopyrite, sphalerite and
pyrite
(HOM, Mindat).
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