/berr"treuhn duyt'/, n.
a mineral, hydrous beryllium silicate, Be4Si2O7(OH)2, colorless or pale yellow, with a vitreous luster, occurring as tabular or prismatic crystals in pegmatites and hydrothermal veins.
[1885-90; < F, after E. Bertrand, French mineralogist, who first described it; see -ITE1]

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Universalium. 2010.

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