brookite

brook·ite

B0502900 (bro͝ok′īt′)n. A mineral form of titanium dioxide, TiO₂, having characteristic orthorhombic crystals and a red-brown to black color.

[After Henry James Brooke (1771-1857), British mineralogist.]

brookite

(ˈbrʊkaɪt) n (Minerals) a reddish-brown to black mineral consisting of titanium oxide in orthorhombic crystalline form: occurs in silica veins. Formula: TiO2[C19: named after Henry J. Brooke (died 1857), English mineralogist]

Brookite

brookite

[′bru̇‚kīt] (mineralogy) TiO₂ A brown, reddish, or black orthorhombic mineral; it is trimorphous with rutile and anatase, has hardness of 5.5-6 on Mohs scale, and a specific gravity of 3.87-4.08. Also known as pyromelane.

Brookite

a mineral of composition TiO₂. Sometimes contains admixtures of iron and niobium. Layered structure, consisting of octahedral groups of TiO₆, united by common ribs. Crystallizes in a rhombic system. The crystals are usually tabular, less frequently prismatic and dipyramidal. Their color is yellowish brown to reddish brown; their luster is adamantine or metallic. The hardness of brookite on the mineralogical scale is 5.5-6; density, 3,900-4,200 kg/m³. The crystals are found in gold placers and in alpine-type veins in the Urals (USSR); abroad the mineral is found in Switzerland, France, Austria, and the USA.

单词	brookite
释义	brookite brook·ite B0502900 (bro͝ok′īt′)n. A mineral form of titanium dioxide, TiO₂, having characteristic orthorhombic crystals and a red-brown to black color. [After Henry James Brooke (1771-1857), British mineralogist.] brookite (ˈbrʊkaɪt) n (Minerals) a reddish-brown to black mineral consisting of titanium oxide in orthorhombic crystalline form: occurs in silica veins. Formula: TiO2[C19: named after Henry J. Brooke (died 1857), English mineralogist] Brookite brookite [′bru̇‚kīt] (mineralogy) TiO₂ A brown, reddish, or black orthorhombic mineral; it is trimorphous with rutile and anatase, has hardness of 5.5-6 on Mohs scale, and a specific gravity of 3.87-4.08. Also known as pyromelane. Brookite a mineral of composition TiO₂. Sometimes contains admixtures of iron and niobium. Layered structure, consisting of octahedral groups of TiO₆, united by common ribs. Crystallizes in a rhombic system. The crystals are usually tabular, less frequently prismatic and dipyramidal. Their color is yellowish brown to reddish brown; their luster is adamantine or metallic. The hardness of brookite on the mineralogical scale is 5.5-6; density, 3,900-4,200 kg/m³. The crystals are found in gold placers and in alpine-type veins in the Urals (USSR); abroad the mineral is found in Switzerland, France, Austria, and the USA.
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