Titanite

titanite

[′tīt·ən‚īt] (mineralogy) sphene

Titanite

(also sphene), a silicate mineral having an isolated arrangement of SiO₄ tetrahedrons and a chemical formula of CaTiO[SiO₄]. Titanite contains admixtures of Fe²⁺ and Fe³⁺ and has up to 12 percent (Ce, Y)₂O₃ (in keilhauite, a variety of titanite), Mn, Sn, Nb, and Cr. Crystallizing in the monoclinic system, titanite generally forms separate crystals in the form of flattened prisms having a characteristic wedge-shaped cross section. The mineral also occurs as granular aggregates.

Titanite can be yellow, brown, or green; sometimes it is black or reddish. It has an adamantine luster, a hardness on Mohs’ scale of 5–6, and a density of 3,300–3,600 kg/m³. Titanite is widely distributed as an accessory mineral in igneous rocks; it occurs most often in alkalic rocks but is sometimes found in metamorphic gneisses and other rocks and in hydrothermal formations. In significant accumulations, titanite is a source of Ti.

单词	titanite
释义	titanite ti·tan·ite T0235100 (tīt′n-īt′)n. See sphene. titanite (ˈtaɪtəˌnaɪt) n (Minerals) another name for sphene[C19: from German Titanit, so named because it contained titanium] Titanite titanite [′tīt·ən‚īt] (mineralogy) sphene Titanite (also sphene), a silicate mineral having an isolated arrangement of SiO₄ tetrahedrons and a chemical formula of CaTiO[SiO₄]. Titanite contains admixtures of Fe²⁺ and Fe³⁺ and has up to 12 percent (Ce, Y)₂O₃ (in keilhauite, a variety of titanite), Mn, Sn, Nb, and Cr. Crystallizing in the monoclinic system, titanite generally forms separate crystals in the form of flattened prisms having a characteristic wedge-shaped cross section. The mineral also occurs as granular aggregates. Titanite can be yellow, brown, or green; sometimes it is black or reddish. It has an adamantine luster, a hardness on Mohs’ scale of 5–6, and a density of 3,300–3,600 kg/m³. Titanite is widely distributed as an accessory mineral in igneous rocks; it occurs most often in alkalic rocks but is sometimes found in metamorphic gneisses and other rocks and in hydrothermal formations. In significant accumulations, titanite is a source of Ti.
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titanite

ti·tan·ite

titanite

Titanite

titanite

Titanite