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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.



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.

References in periodicals archive ?
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.
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.
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.
Associated minerals are: chalcocyanite, dolerophanite, euchlorine, fedotovite, tenorite, cuprian anglesite and gold.
Tenorite is an uncommon secondary mineral in the oxidation zone.
Primary Copper Minerals Secondary Copper Minerals Bornite Tenorite Antlerite Devilline Chalcopyrite Tetrahedrite Aurichalcite Langite Chalcocite Azurite Malachite Covellite Brochantite Metatorbernite Cuprite Calciovolborthite Metazeunerite Digenite Chalcanthite Olivenite Djurleite Chalcoalumite Parnauite Enargite Chrysocolla Vesignieite Lautite Conichalcite Volborthite Tennantite Cyanotrichite Zeunerite
Other minerals thus formed at Monte Somma/Vesuvius are tenorite, boric acid, and compounds of sodium, copper and lead.
In old collections and museums it is possible to see specimens of azurite, malachite, cuprite, tenorite, native copper and other typical species from Rio Tinto.
Associated minerals: fedotovite, tenorite, langbeinite and lammerite.