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[tef-roh-ahyt] /ˈtɛf roʊˌaɪt/
a mineral, silicate of manganese, Mn 2 SiO 4 , occurring in orthorhombic crystals.
1865-70; < German Tephroit < Greek tephró(s) ash gray + German -it -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for tephroite

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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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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