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Siderite With Pyrrhotite & Dolomite

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CLB144124

Siderite With Pyrrhotite & Dolomite

ex collection Aidara/Hühne
Classic Locality

Description Tabs

Description
Locality: 
Morro Velho Mine, Nova Lima, Minas Gerais, Brazil
Size Range: 
Cabinet (10-18 cm)
Size: 
15.4 × 6.5 × 4.3 cm
Description

Geeenish-brown, lustrous siderite crystals with brassy pyrrhotite, white dolomite and brassy marcasite (pseudomorph after pyrrhotite?). A very good specimen which should be trimmed nicely.

Mineral Data
What's on the rock

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Pyrrhotite

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

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

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