sillimanite


sillimanite
/sil"euh meuh nuyt'/, n.
a mineral, aluminum silicate, Al2SiO5, occurring in the form of long, slender, and often fibrous crystals. Also called fibrolite.
[1825-30; named after B. SILLIMAN; see -ITE1]

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Brown, pale green, or white glassy silicate mineral that often occurs in long, slender, needlelike crystals frequently found in fibrous aggregates.

An aluminum silicate, Al2OSiO4, it occurs in high-temperature regionally metamorphosed clay-rich rocks (e.g., schists and gneisses). Sillimanite is found at many localities in France, Madagascar, and the eastern U.S.; a pale sapphire-blue gem variety occurs in the gravels of Sri Lanka.

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also called  Fibrolite,  

      brown, pale green, or white glassy silicate mineral that often occurs in long, slender, needlelike crystals frequently found in fibrous aggregates. An aluminum silicate, Al2OSiO4, it occurs in high-temperature regionally metamorphosed clay-rich rocks (e.g., schists and gneisses). Sillimanite is found at many points in France, Madagascar, and the eastern United States; a pale sapphire-blue gem variety occurs in the gravels of Sri Lanka. For detailed physical properties, see silicate mineral (table). Sillimanite is polymorphous (having the same chemistry but different crystal structure) with kyanite and andalusite.

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Universalium. 2010.

Look at other dictionaries:

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  • SILLIMANITE — Avec le disthène et l’andalousite, la sillimanite (du nom de Benjamin Silliman) fait partie du groupe des silicates d’alumine anhydres. C’est un subnésosilicate, c’est à dire que la trame cristalline est constituée d’octaèdres Al6 ayant leurs… …   Encyclopédie Universelle

  • Sillimanite — Sil li*man*ite, n. [After Benjamin Siliman, an American meneralogist.] (Min.) Same as {Fibrolite}. [1913 Webster] …   The Collaborative International Dictionary of English

  • sillimanite — ☆ sillimanite [sil′ə mə nīt΄ ] n. [after B. Silliman (1779 1864), U.S. chemist and geologist + ITE1] a very hard, mineral, aluminum silicate, Al2SiO5, usually found in metamorphic rock as long, slender crystals of various colors …   English World dictionary

  • Sillimanite — right Sillimanite also called Bucholzite is an alumino silicate mineral with the chemical formula Al2SiO5. Sillimanite is named after the American chemist Benjamin Silliman (1779 1864).OccurrenceSillimanite is one of three alumino silicate… …   Wikipedia

  • sillimanite — Fibrolite Fi bro*lite (? or ?), n. [L. fibra a fiber + lite: cf. F. fibrolithe.] (Min.) A silicate of alumina, of fibrous or columnar structure. It is like andalusite in composition; called also {sillimanite}, and {bucholizite}. [1913 Webster] …   The Collaborative International Dictionary of English

  • sillimanite — silimanitas statusas T sritis chemija apibrėžtis Mineralas. formulė Al₂[O|SiO₄] atitikmenys: angl. sillimanite rus. силлиманит …   Chemijos terminų aiškinamasis žodynas

  • sillimanite — noun Etymology: Benjamin Silliman died 1864 American geologist Date: circa 1830 a brown, grayish, or pale green mineral that consists of an aluminum silicate in orthorhombic crystals often occurring in fibrous or columnar forms …   New Collegiate Dictionary

  • sillimanite — noun A fibrous neosilicate mineral, polymorphic with andalusite and kyanite, with the chemical formula AlSiO …   Wiktionary

  • sillimanite — (sil li ma ni t ) s. f. Corps biréfringent à deux axes …   Dictionnaire de la Langue Française d'Émile Littré