cassiterite

cas·sit·er·ite

C0146000 (kə-sĭt′ə-rīt′)n. A light yellow, red-brown, or black mineral, SnO₂, that is an important tin ore. Also called tinstone.

[French cassitérite, from Greek kassiteros, tin.]

cassiterite

(kəˈsɪtəˌraɪt) n (Minerals) a black or brown mineral, found in igneous rocks and hydrothermal veins. It is a source of tin. Composition: tin oxide. Formula: SnO2. Crystal structure: tetragonal. Also called: tinstone [C19: from Greek kassiteros tin]

cas•sit•er•ite

(kəˈsɪt əˌraɪt)

n. a brown or black mineral, tin dioxide, SnO₂, usu. found as fibrous masses or placer deposits; the chief ore of tin. [1855–60; < Greek kassíter(os) tin + -ite¹]

Thesaurus

Noun

cassiterite - a hard heavy dark mineral that is the chief source of tinatomic number 50, Sn, tin - a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxidemineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition

cassiterite

(kəsĭt`ərīt), heavy, brown-to-black mineral, tin oxide, SnO₂, crystallizing in the tetragonal system. It is found as short prismatic crystals and as irregular masses, usually in veins and replacement deposits associated with granites. Since it is hard, heavy, and resistant to weathering, it often concentrates in alluvial deposits derived from cassiterite-bearing rocks. It is the principal ore of tin and is mined in many countries; the most important sources are Malaysia, Thailand, China, Indonesia, Bolivia, and Russia. Except for Bolivia, nearly all of this production is from alluvial deposits.

Cassiterite

(or tinstone), a mineral with the chemical composition Sno₂. Theoretically it contains 78.62 percent Sn but usually includes impurities of Nb, Ta, Zr, Sc, W, and Fe; thus, the Sn content varies within 68–78 percent.

Cassiterite crystallizes in the tetragonal system, forming prismatic or dipyrimidal crystals. Geniculated twins are characteristic. The crystalline structure is analogous to that of rutile. Cassiterite is usually encountered in the form of small and large crystals, drusoid aggregates, or compact granular masses as well as in the form of cryptocrystalline, colloform segregations, concretions, and sinter formations. The color is dark brown, almost black, yellow with a reddish brown cast; nearly colorless varieties are also known. Cassiterite has an adamantine luster, a hardness of 6–7 on the mineralogical scale, and a density of 6, 040–7, 120 kg/m³ (lowest in light-colored cassiterite).

The deposits are usually genetically linked with granitic rocks. The most interesting commercial accumulations of the mineral are characteristic for hydrothermal quartz-cassiterite and sulfide-cassiterite veins. Cassiterite is stable in zones of oxidation and surface weathering; with the destruction of primary deposits, it accumulates in placers. In the USSR, cassiterite deposits are found in the northeast in Primor’e, in Middle Asia, and in the Kazakh SSR. Abroad, it is found in Malaysia, Thailand, Indonesia, the People’s Republic of China, Bolivia, Nigeria, and elsewhere. Cassiterite is the chief ore for obtaining tin.

A. B. PAVLOVSKII

cassiterite

[kə′sid·ə‚rīt] (mineralogy) SnO₂ A yellow, black, or brown mineral that crystallizes in the tetragonal system in prisms terminated by dipyramids; the most important ore of tin. Also known as tin stone.

cassiterite

cas·sit·er·ite

cassiterite

cas•sit•er•ite

cassiterite

cassiterite

Cassiterite

cassiterite

cassiterite

Words related to cassiterite

noun a hard heavy dark mineral that is the chief source of tin

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