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roscoelite

[ros-koh-lahyt] /ˈrɒs koʊˌlaɪt/
noun, Mineralogy
1.
a brown variety of muscovite in which some aluminum is replaced by vanadium.
Origin
1875-1880
1875-80; named after Sir Henry Roscoe (1833-1915), English chemist; see -lite
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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