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CuS
Hexagonal
Covellite, a copper sulfide mineral, is rare locally, but has been found at Sterling Hill (Frondel, 1972) and may occur at Franklin as well. Most specimens labeled covellite are mislabeled; indigo-blue tarnishes on other minerals, chiefly bornite, chalcopyrite, sphalerite, and franklinite, have been mislabeled as covellite. Covellite is indigo-blue, platy with perfect cleavage, very brittle, and is found as microscopic crystals with secondary sulfides and within assemblages of altered sulfides. It has been found with late-stage gypsum from Sterling Hill, and also was found associated with allactite and with the unnamed ferric-iron analogue of hematolite from Sterling Hill (Dunn and Peacor, 1983b). Jenkins and Misiur (1994) reported an occurrence below the 700 level at Sterling Hill. No analytical data exist.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 11, 2001 |
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