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Pyrrhotite & Cubanite

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PDM776960

Pyrrhotite & Cubanite

Classic Locality

Description Tabs

Description
Locality: 
Morro Velho Mine, Nova Lima, Minas Gerais, Brazil
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.6 × 5.3 × 2.6 cm
Description

Bright brass-coloured hexagonal tabular crystals of pyrrhotite with some slender elongated, or cyclically twinned golden crystals of cubanite, that are richly spread on translucent lenticular crystals of dolomite.

Acquired before 1980. Ex. Gabriel Fauvart collection, with label.

Mineral Data
What's on the rock

Pyrrhotite

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

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

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