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tephroite

[tef-roh-ahyt] /ˈtɛf roʊˌaɪt/
noun
1.
a mineral, silicate of manganese, Mn 2 SiO 4 , occurring in orthorhombic crystals.
Origin of tephroite
1865-1870
1865-70; < German Tephroit < Greek tephró(s) ash gray + German -it -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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