bertrandite

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bertrandite [′bər·trən‚dīt]

(mineralogy)

Be₄Si₂O₇(OH)₂A 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.

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About 60% of world production is from bertrandite [[Be.

Emerald and aquamarine mineralization in Canada by Neufeld, Heather L.D. / Geoscience Canada

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