bornite

A Dictionary of Earth Sciences | 1999 | 495 words | Copyright

bornite (peacock ore) Common and important copper ore mineral, Cu₅FeS₄; sp. gr. 5.0–5.1; hardness 3; cubic; reddish-brown to various shades of purplish-blue, the colours iridescent on tarnished surfaces; pale grey streak; metallic lustre; crystals rough cubes, rhombododecahedra, can also be massive; cleavage poor {111}; occurs in hydrothermal veins, in zones of secondary enrichment, and in various syngenetic copper ores, porphyry copper deposits, skarns, etc.; soluble in nitric acid.

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AILSA ALLABY and MICHAEL ALLABY. "bornite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 13 Feb. 2012 <http://www.encyclopedia.com>.

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