/tef"roh uyt'/, n.
a mineral, silicate of manganese, Mn2SiO4, occurring in orthorhombic crystals.
[1865-70; < G Tephroit < Gk tephró(s) ash gray + G -it -ITE1]

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      olivine mineral found only in iron-manganese ore deposits and skarns and in metamorphosed manganese-rich sediments, such as those of Cornwall, Eng., and Franklin, N.J., in the United States. Tephroite (manganese silicate; Mn2SiO4) forms a solid solution series with the olivine fayalite in which iron completely replaces manganese in the molecular structure. For detailed physical properties, see olivine (table).

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Universalium. 2010.

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  • Tephroite — is a non metallic manganese silicate mineral with the formula, Mn2SiO4, that is one of the unusual minerals found at the famous mines of Sterling Hill and Franklin, New Jersey, USA. It can also be found in England and Sweden.Tephroite has a… …   Wikipedia

  • Tephroite — Teph ro*ite, n. [See {Tephrosia}.] (Min.) A silicate of manganese of an ash gray color. [1913 Webster] …   The Collaborative International Dictionary of English

  • téphroïte — ● téphroïte nom féminin Silicate naturel de manganèse, orthorhombique, du groupe de l olivine …   Encyclopédie Universelle

  • tephroite — ˈtefrōˌīt noun ( s) Etymology: German tephroit, from Greek tephros ash gray + German it ite : a mineral Mn2SiO4 that consists of Manganese silicate and is isomorphous with olivine * * * /tef roh uyt /, n. a mineral, silicate of manganese, Mn2SiO4 …   Useful english dictionary

  • téphroïte — (entrée créée par le supplément) (té fro i t ) s. f. Terme de minéralogie. Silicate de manganèse et de magnésie, brun rougeâtre. ÉTYMOLOGIE    Du grec, cendre, et, forme …   Dictionnaire de la Langue Française d'Émile Littré

  • tephroite — teph·ro·ite …   English syllables

  • olivine — olivinic /ol euh vin ik/, olivinitic /ol euh vi nit ik/, adj. /ol euh veen , ol euh veen /, n. Mineral. any of a group of magnesium iron silicates, (Mg,Fe)2SiO4, occurring in olive green to gray green masses as an important constituent of basic… …   Universalium

  • Tephroit — und Willemit aus der Franklin Mine, Sussex County (New Jersey), USA Chemische Formel Mn2SiO4 …   Deutsch Wikipedia

  • Fayalite — Catégorie IX : silicates[1] Fayalite Coso Hot Springs, Californie, États Unis (XX 1 mm) …   Wikipédia en Français

  • Forsterite — (big tabular and colorless) on sanidine (little colorless crystals)<bg />with hematite (redish) General …   Wikipedia

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