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Mineralpedia Details for Freibergite

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Freibergite

Freibergite

Named after the type locality at the Reiche Zeche mine in Freiberg, Germany. Found in hydrothermal deposits and widespread worldwide, Freibergite can be found in, additionally, the Czech republic, Russia, Sweden, Norway, Scotland, Canada, Bolivia, Japan, Australia, and several other localities. Feibergite occurs with a wide variety of sulfosalts and sulfides.

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

Formula
Ag6Cu4Fe2Sb4S13 
Crystal System
Isometric 
Crystal Habit
Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
gray, steel gray, black 
Streak
reddish black 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 
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Freibergite from Obecnice, Pribram, Czech Republic

Freibergite
            from Obecnice, Pribram, Czech Republic

Euhedral well-formed tetrahedrons, the largest to 8mm across with several smaller amongst discoidal Siderite crystals.

Click thumbnail images for larger view.

Freibergite from Zaca mine, Alpine Co., California, United States

Freibergite
            from Zaca mine, Alpine Co., California, United States

Excellent well-formed crystal to about 0.75mm with numerous faces.

Click thumbnail images for larger view.

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