cordierite

cordierite
/kawr"dee euh ruyt'/, n.
a strongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks. Also called dichroite, iolite.
[1805-15; named after Pierre L. A. Cordier (1777-1861), French geologist; see -ITE1]

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also called  dichroite  or  iolite 
 blue silicate mineral that occurs as crystals or grains in igneous rocks. It typically occurs in thermally altered clay-rich sediments surrounding igneous intrusions and in schists and paragneisses. Precambrian deposits of the Laramie Range, Wyo., U.S., contain more than 500,000 tons of cordierite. Cordierite is sometimes called dichroite because of its marked pleochroism (different coloured light is transmitted in different directions). For chemical formula and detailed physical properties, see silicate mineral (table).

      The natural mineral has little commercial use. When clear, cordierite is sometimes cut as a gem; the stones from the gem gravels of Sri Lanka have been called water sapphires. Synthetic magnesium cordierite has a low thermal expansion and is used as a semirefractory material because of its resistance to thermal shock.

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Universalium. 2010.

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  • Cordierite — from Italy General Category Silicate mineral Chemical formula …   Wikipedia

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  • CORDIÉRITE — Minéral auquel le géologue français Louis Cordier donna son nom, connu aussi sous les termes d’iolite (roche violette) ou de dichroïte (roche bicolore). Longtemps classée parmi les cyclosilicates, la cordiérite est classée parmi les… …   Encyclopédie Universelle

  • Cordierite — Cor di*er*ite (k[^o]r d[i^]*[ e]r*[imac]t), n. [Named after the geologist Cordier.] (Min.) See {Iolite}. [1913 Webster] …   The Collaborative International Dictionary of English

  • cordierite — [kôr′dē ər īt΄] n. [after P. L. A. Cordier (1777 1861), Fr geologist + ITE1] a bluish, very hard, pleochroic, crystalline mineral, magnesium aluminum silicate, (Mg,Fe) 2 Al4Si5O18, used sometimes as a gem …   English World dictionary

  • cordierite — kordieritas statusas T sritis chemija apibrėžtis Mineralas. formulė Mg₂Al₃[AlSi₅O₁₈] atitikmenys: angl. cordierite rus. кордиерит …   Chemijos terminų aiškinamasis žodynas

  • cordierite — noun Etymology: French, from Pierre L. A. Cordier died 1861 French geologist Date: circa 1814 a blue mineral of vitreous luster and strong dichroism that consists of a silicate of aluminum, iron, and magnesium …   New Collegiate Dictionary

  • cordierite — noun a magnesium iron aluminium cyclosilicate Syn: iolite …   Wiktionary

  • cordierite — cor·die·rì·te s.f. TS mineral. minerale rombico, costituente di alcune rocce metamorfiche, formato da silicato di magnesio e ferro, presente in vari colori tra cui l azzurro, che viene impiegato come sostitutivo meno pregiato dello zaffiro… …   Dizionario italiano

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