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bertrandite

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WordReference Random House Unabridged Dictionary of American English © 2026

ber•trand•ite n.

Mineralogya 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.

French, after English. Bertrand, French mineralogist, who first described it; see -ite¹
1885–90

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