Cubanite

Locality: Henderson No. 2 mine, Chibougamau, Nord-du-Québec, Québec, Canada Copyright © John A. Jaszczak.
Chemical Formula: CuFe2S3
Locality: Barracanao, Cuba.
Name Origin: Named after its locality.
Cubanite is a yellow mineral of copper, iron, and sulfur, CuFe2S3.Cubanite was first described in 1843 for an occurrence in the Mayarí-Baracoa Belt, Oriente Province, Cuba.Cubanite occurs in high temperature hydrothermal deposits with pyrrhotite and pentlandite as intergrowths with chalcopyrite. It results from exsolution from chalcopyrite at temperatures below 200 to 210 °C. It has also been reported from carbonaceous chondrite meteorites.

Physical Properties of Cubanite

Cleavage: None
Color: Brass yellow, Bronze yellow.
Density: 4.7
Diaphaneity: Opaque
Fracture: Conchoidal – Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Hardness: 3.5 – Copper Penny
Luminescence: Non-fluorescent.
Luster: Metallic
Magnetism: Strongly magnetic
Streak: black

Photos :

Cubanite Henderson Mine, Chibougamau, Quebec, Canada 29mm x 22mm x 4mm “Courtesy of Rob Lavinsky, The Arkenstone, www.iRocks.com”
This sample of cubanite is displayed in the Smithsonian Museum of Natural History. The sample is about 6×10 cm and is from Henderson mine #2, Chibougamah, Quebec, Canada.
Quartz with Siderite, Dolomite, Pyrrhotite, Cubanite  Morro Velho mine, Nova Lima, Minas Gerais, Brazil Size: 21.0 x 18.0 x 6.5 cm Copyright © danweinrich
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