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Tetrahedrite with Fluorite

#PD33539

Tetrahedrite with Fluorite

#PD33539
Availability
Sold
Size
5.5 x 9 x 4 cm - Sm Cabinet 
Formula
Cu12Sb4S13 (RRUFF)
Locality
Freiberg dist., Erzgebirge, Saxony, Germany
Tagged
sulfide

Tetrahedrite crystals 5mm with a late coating of Chalcopyrite imparting a brassy color. The Chalcopyrite seems to be epitaxial but this is not definitive, Associated with the these sulfides are light purple cubic crystals Fluorite. The Tetrahedrite is also included within the Fluorite as superb crystals. Possible minor, exceptional octahedral Pyrite and possibly Pyrrhotite micro crystals. This specimen was once in the US National Museum collection as the old label shows with a number matching the specimen.

Antique Specimen

Tetrahedrite

Formula
Cu12Sb4S13 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Massive 
Cleavage
None, None, None 
Luster
Metallic 
Color
iron gray, black, steel gray 
Streak
black 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 

Data courtesy of Webmineral.

Collection
Phillips Collection
Special Info
Antique Specimen

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