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Freieslebenite is a rare sulfosalt mineral of antimony, lead and silver with formula AgPbSbS3 and molecular weight of 533.02 g/mol. It is an opaque non-fluorescent mineral which has a hydrothermal origin. It is metallic, with a specific gravity of 6.3 and a Mohs hardness of 2.5 - about that of a finger nail. It is non-magnetic and is usually gray in colour. It has indistinct cleavage, and is brittle and has a conchoidal fracture. It can have a white or gray streak. It crystallizes in the monoclinic system.
It was first described in 1773 from an occurrence in Freiberg District, Erzgebirge, Saxony, Germany, and given the current name in 1845 for Johann Karl Freiesleben (1774 - 1846), Mining Commissioner of Saxony, Germany.
1. ^ Palache, C., H. Berman, and C. Frondel (1944) Dana’s System of Mineralogy, Wiley (7th edition), v. I, 416–418
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