Sulphosalt, the triclinic paramorph of miargyrite (monoclinic) and cuboargyrite (isometric)
Specific gravity: 5.33
Streak: Greyish black
Colour: Greyish black to black
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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