Covellite


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Related to Covellite: Enargite

covellite

[kō′ve‚līt]
(mineralogy)
CuS An indigo-blue mineral of metallic luster that crystallizes in the hexagonal system; it is usually massive or occurs in disseminations through other copper minerals and represents an ore of copper. Also known as indigo copper.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Covellite

 

(named for its discoverer, the Italian chemist N. Covelli, 1790–1829), a mineral of the sulfide class. Chemical composition, CuS; it contains 66.48 percent Cu and 33.52 percent S. The structure of covellite has Cu+ and Cu2+ atoms, as well as the simple ion S2– and the paired ion S22–. The structural elements of Cu2+ surrounded by three S2– and Cu+ ions, which are in the centers of paired tetrahedrons connected by S22 ions, are located in layers and provide the perfect cleavage of covellite. Thus, the structurally regular formula for covellite will be (Cu2S#x00B7;CuS2). Crystals are very rare; secondary incrustations, as well as films on other sulfides or powdery masses that replace them, are common. The color is dark blue. Hardness on the mineralogical scale, 1.5–2.0; density, 4,590–4,670 kg/m3. Covellite is a typical mineral in the zone of secondary sulfide enrichment in the oxidized parts of sulfide copper deposits. It is used as a copper ore.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
In addition, a broad band extending into the near-IR region can be observed, which is characteristic of covellite CuS.
Matthews, "Experimental study of the copper isotope fractionation between aqueous Cu(II) and covellite, CuS," Chemical Geology, vol.
Well-defined (1 0 1), (1 0 2), (1 0 3), (1 1 0), and (1 1 6) peaks at 2[theta] = 27.74[degrees], 29.48[degrees], 31.76[degrees], 48.24[degrees], and 59.64[degrees] are observed in the XRD pattern due to hexagonal covellite phase of CuS (the lattice parameters are as follows: a = b = 3.792 [Angstrom], c = 16.344 [Angstrom]) for the TF1, as shown in Figure 1.
The mineralogy of the Copper lodes consists of chalcopyrite, pyrite, chalcocite, covellite and marcasite.
Other minerals present in the upper zone include bornite, covellite, chalcocite, prousite, hematite, kaolin, and illite-smectite.
Copper minerals are atacamite and brochantite in the oxide zone; chalcocite, covellite, and pyrite in the enriched zone; and chalcopyrite, bornite, molybdenite, tennantite, and pyrite in the hypogene zone.
Direct and indirect mechanisms in the bacterial leaching of covellite. Biotechnology Letters.
This yields an environmentally benign solid leach residue, in the form of covellite, for pyrometallurgical treatment.
The mineralogy of the milled Haib feed revealed over 98.5% Chalcopyrite, 1% Bornite, and less than 0.5% of Chalcocite, Covellite, Malachite and Chrysocolla.