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CuO A triclinic mineral that occurs in small, shining, steel-gray scales, in black powder, or in black earthy masses; an ore of 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 It might be outdated or ideologically biased.



named for the Italian botanist M. Tenore, 1780–1861), a mineral of the oxide class, natural cupric oxide, CuO, containing 79.89 percent Cu.

Tenorite crystallizes in the monoclinic system. It occurs as concentrically botryoidal formations composed of minute lamellar crystals; dense grainy aggregates, known as melaconite, are sometimes found. Tenorite has a hardness of 3.5–1 on Mohs’ scale, and its density is 5,800–6,400 kg/m3. It is formed in the oxidation zone of copper deposits together with cuprite, malachite, chrysocolla, and native copper; less frequently it forms in volcanic sublimates. Tenorite forms no natural deposits and is extracted as a by-product with other copper minerals from the oxidation zone. It is a copper ore.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The XRD pattern obtained for the decomposition product ED3 reveals crystallinity with major peaks at 2[theta] values 35.52, 38.72, 48.82, 61.34, and 68.08 corresponding to the database 2[theta] values of JCPDS card number 48-1548 exhibiting copper(II) oxide (tenorite phase).
One-step synthesis of tenorite (CuO) nano-particles from Cu<sub>4</sub>(SO<sub>4</sub>)(OH)<sub>6</sub> by direct thermal-decomposition method, Materials Letters, 65: 171-174.
The specimens show bright baby-blue chrysocolla completely replacing octahedral and cuboc-tahedral crystals to 6 mm; some of the pseudocrystals rest in veins in a matrix mixture of black tenorite, blue massive chrysocolla, and white calcite.
(2003) This study Azurite X X Barite X Brochantite X X Chalcocite X X Chalcanthite X Chrysocolla X X Copper X X Covellite X Cuprite X X Delafossite X Malachite X X Neotocite X Plancheite X Tenorite ("melaconite") X X [FIGURE 15 OMITTED]
Gordon (1944) found black massive tenorite with chalcanthite in the Rosas vein.
(4.) [[Cu.sub.8]([Si.sub.8][O.sub.22])(OH)[.sub.4].[(dehydrated plancheite)]] [right arrow] [8CuO + 8Si[O.sub.2] + 2[H.sub.2]O.[(tenorite)]]
In the oxidized zones and in areas of recrystallization on secondary fault plains and cavities, chalcocite, cuprite, tenorite, malachite, azurite, chrysocolla, and various sulfates replace the original copper sulfides.
However, Brandstatter and Niedermayr (1993, 1994) investigated the metallic inclusions noted earlier by others and found them to be native copper; inclusions of black tenorite were also found in elbaite.
Associated minerals are: hematite, tenorite, lammerite, urusovite, orthoclase and johillerite.
It was also recognized by Ratcliff (1973) in the Continental pit area, where it formerly occurred in small amounts in the walls of the small pits at the Butte-Duluth, Bullwhacker, and Sarsfield mines, together with chrysocolla, cuprite, azurite, malachite, and tenorite. All of these mines predated the present Continental pit.
Among them: tenorite, "illite" and zinnwaldite (from basalt cavities in the Molana quarry), hyalophane (adularia-like crystals associated with barite), marokite and "axinite" (a group name; actually only two members of this group, manganaxinite and tinzenite, are reported from Val Graveglia).
Associated minerals are: ponomarevite, piypite, sylvite and lesser amounts of dolerophanite, euchiorine, tenorite, hematite and two unknown As-bearing minerals.