Freibergite
A variety of Minerals
What is Freibergite?
Freibergite is a complex sulfosalt mineral of silver, copper, iron, antimony and arsenic with formula (Ag,Cu,Fe)12(Sb,As)4S13. It has cubic crystals and is formed in hydrothermal deposits. It forms one solid solution series with tetrahedrite and another with argentotennantite. Freibergite is an opaque, metallic steel grey to black and leaves a reddish-black streak. It has a Mohs hardness of 3.5 to 4.0 and a specific gravity of 4.85 - 5. It is typically massive to granular in habit with no cleavage and an irregular fracture. The mineral was first described in 1853 from an occurrence in the silver mines of the type locality at Freiberg, Saxony.
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Quick Facts
Physical Properties
- Color
- Grey
- Hardness (Mohs)
- 3.5 - 4
- Density
- 5.41 g/cm³
- Streak
- Reddish black
Chemical Properties
- Chemical Formula
- (Ag,Cu,◻)10Fe2+2Sb4S12◻ May also be expressed as (Ag4+2xCu2-2x)[(Cu,Ag)4(Fe,Zn)2]Sb4S12S1-x (0 < x < 1). Note however that if x < 1, this suggested formula cannot be charge balanced.
- Elements
- Ag, Cu, Fe, S, Sb
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