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Cubanite & Pyrrhotite On Dolomite

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CLB165057

Cubanite & Pyrrhotite On Dolomite

Rare Mineral

Description Tabs

Description
Locality: 
Morro Velho Mine, Nova Lima, Minas Gerais, Brazil
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.2 × 4.8 × 3.5 cm
Largest Crystal: 
2.70cm
Description

Very aesthetic specimen of highly lustrous and translucent, colorless dolomite crystals, sprinkled with brassy, partly iridescent crystals of cubanite and brassy, platy pyrrhotite from a 1960s find.

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

Dolomite

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