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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.
Specialisation was manifest in the massive presence of copper ores (carbonates: malachite and azurite; oxides: cuprite, tenorite and sulphides: chalcocite and covellite), the distribution of features (furnaces) and artefacts (crucibles, hammers, moulds) relating to copper production (Figure 4).
Copper minerals comprising the "oxide zone" include chrysocolla, atacamite, conicalcite, malachite and azurite, with lesser brochantite, calcantite (green and blue copper), cuprite, copper-bearing hematite (red copper) and tenorite, neotocite and copperwad (black copper) with the occurrence of more rare copper minerals.
The vehicle is available in Carneol Red, Obsidian Black, Calcite White, Tenorite Grey, Iridium Silver and Cubanite Silver colours.