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Cubanite Pyrrhotite Siderite & Dolomite

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TPX514877

Cubanite Pyrrhotite Siderite & Dolomite

Classic Locality

Description Tabs

Description
Locality: 
Morro Velho Mine, Nova Lima, Minas Gerais, Brazil
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.8 × 4.7 × 4.5 cm
Weight: 
104.00gr
Description

Here is a classic of this famous gold mine, the piece is formed by crystals of siderite and dolomite with minor quartz, and dotted with microscopic crystals of pyrrhotite and cubanite.
This piece is very old and hardly findable in the market now.
Ex coll. Ronaldo Gadotti, Marcus Hinder, J.R. Pastor

Mineral Data
What's on the rock

Cubanite

Formula: 
CuFe2S3
Strunz: 
2.CB.55a
Crystal System: 
Orthorhombic
Hardness: 
3.5
Type Locality: 
Barracanao (Baracoa), Moa-Baracoa District, Mayarí-Baracoa Belt, Holguín Province, Cuba

Pyrrhotite

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

Siderite

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

Dolomite

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

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