sillimanite

sil·li·ma·nite

S0408650 (sĭl′ə-mə-nīt′)n. A usually white, hard mineral, Al₂SiO₅, occurring in highly metamorphosed rock as long, slender, fibrous crystals. Also called fibrolite.

[After Benjamin Silliman.]

sillimanite

(ˈsɪlɪməˌnaɪt) n (Minerals) a white, brown, or green fibrous mineral that consists of aluminium silicate in orthorhombic crystalline form and occurs in metamorphic rocks. Formula: Al2SiO5[C19: named after Benjamin Silliman (1779–1864), US chemist]

sil•li•man•ite

(ˈsɪl ə məˌnaɪt)

n. a needlelike or fibrous mineral, aluminum silicate, Al₂SiO₅, synthetic forms of which are used in ceramic insulators. [1825–30; after B. Silliman (1779–1864), U.S. scientist]

Sillimanite

sillimanite

[′sil·ə·mə‚nīt] (mineralogy) Al₂SiO₅ A brown, pale-green, or white neosilicate mineral with vitreous luster crystallizing in the orthorhombic system; commonly occurs in slender crystals, often in fibrous aggregates; hardness is 6-7 on Mohs scale, and specific gravity is 3.23. Also known as fibrolite.

Sillimanite

a mineral of the silicate class. Sillimanite is a high-temperature, polymorphic modification of the composition Al[AlSiO₅] and contains 1–1.5 percent Fe₂O₃ in admixture form. The sillimanite structure is made up of chains of alternating SiO₄ and AlO₄ tetrahedrons, connected by chains of Al octahedrons. The mineral crystallizes in the orthorhombic system, forming acicular crystals, compact radiated masses, or thin fibrous aggregates. It sometimes forms dispersed, filiform inclusions in other minerals (fibrolite variety). Sillimanite is gray, light brown, or pale green; it has a vitreous luster, a hardness of 6.5-7.5 on Mohs’ scale, and a density of 3,270 kg/m³. At high temperatures (approximately 1545°C), it decomposes into mullite and silica.

Sillimanite occurs in thermally and regionally metamorphosed clay rocks. It serves as a raw material in the production of refractories and acid-resistant products with a high alumina content. The largest known sillimanite deposits are in India (Khasi Hills and Pipri).

REFERENCE

Kostov, 1. Mineralogiia. Moscow, 1971. (Translated from English.)

单词	sillimanite
释义	sillimanite sil·li·ma·nite S0408650 (sĭl′ə-mə-nīt′)n. A usually white, hard mineral, Al₂SiO₅, occurring in highly metamorphosed rock as long, slender, fibrous crystals. Also called fibrolite. [After Benjamin Silliman.] sillimanite (ˈsɪlɪməˌnaɪt) n (Minerals) a white, brown, or green fibrous mineral that consists of aluminium silicate in orthorhombic crystalline form and occurs in metamorphic rocks. Formula: Al2SiO5[C19: named after Benjamin Silliman (1779–1864), US chemist] sil•li•man•ite (ˈsɪl ə məˌnaɪt) n. a needlelike or fibrous mineral, aluminum silicate, Al₂SiO₅, synthetic forms of which are used in ceramic insulators. [1825–30; after B. Silliman (1779–1864), U.S. scientist] Sillimanite sillimanite [′sil·ə·mə‚nīt] (mineralogy) Al₂SiO₅ A brown, pale-green, or white neosilicate mineral with vitreous luster crystallizing in the orthorhombic system; commonly occurs in slender crystals, often in fibrous aggregates; hardness is 6-7 on Mohs scale, and specific gravity is 3.23. Also known as fibrolite. Sillimanite a mineral of the silicate class. Sillimanite is a high-temperature, polymorphic modification of the composition Al[AlSiO₅] and contains 1–1.5 percent Fe₂O₃ in admixture form. The sillimanite structure is made up of chains of alternating SiO₄ and AlO₄ tetrahedrons, connected by chains of Al octahedrons. The mineral crystallizes in the orthorhombic system, forming acicular crystals, compact radiated masses, or thin fibrous aggregates. It sometimes forms dispersed, filiform inclusions in other minerals (fibrolite variety). Sillimanite is gray, light brown, or pale green; it has a vitreous luster, a hardness of 6.5-7.5 on Mohs’ scale, and a density of 3,270 kg/m³. At high temperatures (approximately 1545°C), it decomposes into mullite and silica. Sillimanite occurs in thermally and regionally metamorphosed clay rocks. It serves as a raw material in the production of refractories and acid-resistant products with a high alumina content. The largest known sillimanite deposits are in India (Khasi Hills and Pipri). REFERENCE Kostov, 1. Mineralogiia. Moscow, 1971. (Translated from English.)
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