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bertrandite

[bur-truh n-dahyt] /ˈbɜr trənˌdaɪt/
noun
1.
a mineral, hydrous beryllium silicate, Be 4 Si 2 O 7 (OH) 2 , colorless or pale yellow, with a vitreous luster, occurring as tabular or prismatic crystals in pegmatites and hydrothermal veins.
Origin of bertrandite
1885-1890
1885-90; < French, after E. Bertrand, French mineralogist, who first described it; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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