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Meaning of bertrandite

ber•trand•ite

Pronunciation: (bûr'trun-dīt"), [key]
— n.
  1. a mineral, hydrous beryllium silicate, BeSiO(OH), colorless or pale yellow, with a vitreous luster, occurring as tabular or prismatic crystals in pegmatites and hydrothermal veins.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.