Freieslebenite

Freieslebenite is a rare sulfide 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.

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Freieslebenite is normally found in Europe, usually in Romania and Germany. It was discovered in 1845, and is named after Johann Karl Freiesleben (1774 - 1846), Mining Commissioner of Saxony, Germany.

See also

• List of minerals
• List of minerals named after people

References

• Mindat
• WebMineral
• EuroMineral