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Cubanite & Pyrrhotite On Siderite Quartz & Dolomite

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CLB100886

Cubanite & Pyrrhotite On Siderite Quartz & Dolomite

Classic Locality

Description Tabs

Description
Locality: 
Morro Velho Mine, Nova Lima, Minas Gerais, Brazil
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.4 × 3.8 × 2 cm
Largest Crystal: 
3.00cm
Description

A very interesting specimen with a rich paragenesis of dark metallic cubanite and brassy pyrrhotite crystals (up to 0.5 cm) on and included in white translucent dolomite crystals, transparent rock crystals (double terminated). As a highlight this specimen has perefectly developed greenish-golden siderite crystals up to 3 cm.

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

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
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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