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Mineralpedia Details for Cubanite

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Cubanite

Cubanite

Named for the type locality of the mineral in the country Cuba at Barracanao in the Moa-Baracoa district and Mayari-Baracoa belt of the Oriente Province. Cubanite is somewhat common and is widespread, occurring in high temperature hydrothermal deposits in pyrrhotite-pentlandite ore where it occurs in close association with chalcopyrite Rarely, Cubanite can be found in carbonaceous chondrite meteorites. Additionaly localities for Cubanite occur in the United States, Canada, Sweden, Finland, Italy, Brazil, Australia, Russia, and in the Orgueil and Alais meteorites. Brass-yellow to golden-yellow massive but often as sharp, lustrous, elongated crystals. Slightly magnetic. In hydrothermal deposits formed at relatively high temperature, in pyrrhotite–pentlandite ores. Below 200-210 degrees Celsius, Cubanite may exsolve from chalcopyrite. Twinning common as fourlings and pseudohexagonal sixlings.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/cubanite.pdf

Formula
CuFe2S3 
Crystal System
Orthorhombic 
Crystal Habit
Striated 
Cleavage
None, None, None 
Luster
Metallic 
Color
brass yellow, bronze yellow 
Streak
black 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
3.5 
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Cubanite from Tumut district, New South Wales, Australia

Cubanite
            from Tumut district, New South Wales, Australia
Special Info
Phillips Collection

Golden brassy crystalline, slightly magnetic in metamorphosed chloritic(?) schist.

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Cubanite from Henderson No. 2 mine, Chibougamau, Nord-du-Quebec, Quebec, Canada

Cubanite
            from Henderson No. 2 mine, Chibougamau, Nord-du-Quebec, Quebec, Canada

Brassy colored twinned single crystal.

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