bertrandite


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bertrandite

[′bər·trən‚dīt]
(mineralogy)
Be4Si2O7(OH)2 A colorless or pale-yellow mineral consisting of a beryllium silicate occurring in prismatic crystals; hardness is 6-7 on Mohs scale, and specific gravity is 2.59-2.60.
References in periodicals archive ?
About 60% of world production is from bertrandite [[Be.

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