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BORNITE: PRIMARY ORE OF COPPER<br />
Cu5FeS4, Copper Iron Sulfide<br />
Colors are from an iridescent tarnish that forms on bornite upon exposure to air. The tarnish is made of assorted copper oxides or hydroxides that form a mere atoms thin layer over the bornite.

Fphoto-18718705D-2PS.jpg

BORNITE: PRIMARY ORE OF COPPER
Cu5FeS4, Copper Iron Sulfide
Colors are from an iridescent tarnish that forms on bornite upon exposure to air. The tarnish is made of assorted copper oxides or hydroxides that form a mere atoms thin layer over the bornite.

Copyright:© 1987 Paul Silverman - Fundamental Photographs

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Paul Silverman