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tephroite

 - 2 dictionary results

teph⋅ro⋅ite

  [tef-roh-ahyt]
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–noun
a mineral, silicate of manganese, Mn2SiO4, occurring in orthorhombic crystals.
Origin:
1865–70; < G Tephroit < Gk tephró(s) ash gray + G -it -ite 1
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Encyclopedia

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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