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tephroite

[ tef-roh-ahyt ]
/ ˈtɛf roʊˌaɪt /
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noun
a mineral, silicate of manganese, Mn2SiO4, occurring in orthorhombic crystals.
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Origin of tephroite

1865–70; <German Tephroit<Greek tephró(s) ash gray + German -it-ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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