staurolite


staurolite
staurolitic /stawr'euh lit"ik/, adj.
/stawr"euh luyt'/, n.
a mineral, basic iron aluminum silicate, Fe2Al2O7(SiO4)4(OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross.
[1790-1800; < Gk stauró(s) a cross + -LITE]

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Silicate mineral produced by regional metamorphism in rocks such as mica schists, slates, and gneisses, where it is generally associated with other minerals.

Staurolite is a brittle, hard mineral that has a dull lustre. Its crystals are usually dark brown and are often twinned in cruciform patterns (known as fairy crosses) that can be made into ornaments. Staurolite occurs especially in Canada, Brazil, France, Switzerland, and the U.S. (North Carolina, Virginia, and Georgia).

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      silicate mineral [(Fe,Mg,Zn)3-4Al18Si8O48H2-4] produced by regional metamorphism in rocks such as mica schists, slates, and gneisses, where it is generally associated with other minerals such as kyanite, garnet, and tourmaline. Staurolite is a brittle, hard mineral that has a dull lustre. Its crystals are usually dark brown in colour and are often twinned in cruciform patterns (known as fairy crosses) that can be made into ornaments. The name is derived from stauros, the Greek word for cross. Staurolite occurs in Canada; North Carolina, Virginia, and Georgia, U.S.; Brazil; Brittany, France; and Switzerland, especially along the Saint Gotthard Pass. For chemical formula and detailed physical properties, see silicate mineral (table).

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Universalium. 2010.

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  • Staurolite — Catégorie IX : silicates[1] Staurolite Russie Général …   Wikipédia en Français

  • Staurolite — is a red brown to black, mostly opaque, nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has a Mohs hardness of 7 to 7.5 and a rather complex chemical formula: (Fe,Mg,Zn)2Al9(Si,Al)4O20(OH)4. Iron,… …   Wikipedia

  • Staurolite — Stau ro*lite (st[add] r[ o]*l[imac]t), n. [Gr. stayro s a cross + lite.] (Min.) A mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling a cross. It is a silicate of alumina and iron, and… …   The Collaborative International Dictionary of English

  • staurolite — [stôr′ə līt΄] n. [Fr < Gr stauros, a cross, post < IE * steu > ON staurr, post (see STORE) + lite, LITE] a dark colored mineral, (Fe,Mg) 2Al9Si4O23 (OH), a silicate of iron and aluminum: the crystals are often found twinned in the form… …   English World dictionary

  • staurolite — ● staurotide ou staurolite nom féminin Silicate naturel d aluminium et de fer, orthorhombique. (La macle la plus fréquente de ce minerai porte le nom de pierre de croix ou croisette de Bretagne.) …   Encyclopédie Universelle

  • staurolite — staurolitas statusas T sritis chemija apibrėžtis Mineralas. formulė 4Al₂O·[SiO₄]AlFe₂O₃(OH) atitikmenys: angl. staurolite rus. ставролит …   Chemijos terminų aiškinamasis žodynas

  • staurolite — noun Etymology: French, from Greek stauros cross + French lite more at steer Date: circa 1815 a mineral consisting of a basic silicate of iron and aluminum in prismatic orthorhombic crystals often twinned so as to resemble a cross • staurolitic… …   New Collegiate Dictionary

  • staurolite — noun A dark brown nesosilicate mineral that has crystals that cross and intergrow …   Wiktionary

  • staurolite — stau·ro·lì·te s.f. TS mineral. minerale caratteristico di alcune rocce metamorfiche, costituito da allumosilicato, magnesio e zinco, che cristallizza nel sistema rombico formando geminati a croce di colore rosso scuro {{line}} {{/line}} DATA:… …   Dizionario italiano

  • staurolite — n. 1. See staurotide. 2. Harmotome …   New dictionary of synonyms