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Mineralpedia Details for Semseyite

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Semseyite

Semseyite

Named for Hungarian nobleman Andor von Semsey, who had an interest in minerals and could likely be credited as an amateur mineralogist. He is also honored in the naming of Andorite. Semseyite can be found in mid-temperature hydrothermal veins in localities including Romania, Germany, France, Scotland, Bolivia, Peru, the USA, Canada, and Japan as well as in small amounts at other occurrences.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/semseyite.pdf

Formula
Pb9Sb8S21 
Crystal System
Monoclinic 
Crystal Habit
Radial, Spherical, Tabular 
Cleavage
Good, None, None 
Luster
Metallic 
Color
black, gray 
Streak
black 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2.5 
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Semseyite from Herja mine, Baia Mare, Maramures Co., Romania

Semseyite
            from Herja mine, Baia Mare, Maramures Co., Romania

Sheaf-like and stellate crystals to 5mm with a dull, metallic luster of Semseyite scattered on this complex matrix specimen loaded with a host of other minerals including black, fine crystals of Sphalerite and redish brown crystals of discoidal Siderite.

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