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[bur-truh n-dahyt] /ˈbɜr trənˌdaɪt/
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
1885-90; < French, after E. Bertrand, French mineralogist, who first described it; see -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for bertrandite
  • In ore, carbonate clasts have been largely replaced by fluorite that contains submicroscopic bertrandite.
  • Beryllium is a naturally occurring metal found in beryl and bertrandite ores.
  • Beryllium is a metal that is found in nature, especially in beryl and bertrandite rock.
  • Two kinds of mineral rocks, bertrandite and beryl, are mined commercially for the recovery of beryllium.
  • Only two beryllium minerals are of current economic importance, beryl and bertrandite.

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