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Magnetite Pyrrhotite Arsenopyrite Pyrite & Gold

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TRN161700

Magnetite Pyrrhotite Arsenopyrite Pyrite & Gold

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Description Tabs

Description
Locality: 
Geita Mine, Geita Region, Tanzania (United Republic)
Size Range: 
Cabinet (10-18 cm)
Size: 
11 × 7 × 3 cm
Description

Pyrrhotite replacing magnetite in a banded iron formation, microscopic gold and pyrite associated with pyrrhotite, one face polished

Mineral Data
What's on the rock

Magnetite

Formula: 
Fe2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Streak: 
Black

Pyrrhotite

Formula: 
Fe1-xS (x = 0 to 0.17)
Strunz: 
2.CC.10
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0

Arsenopyrite

Formula: 
FeAsS
Strunz: 
2.EB.20
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0

Pyrite

Formula: 
FeS2
Strunz: 
2.EB.05a
Crystal System: 
Isometric
Hardness: 
6.0 - 6.5

Gold

Formula: 
Au
Strunz: 
1.AA.05
Crystal System: 
Isometric
Hardness: 
2.5 - 3.0

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