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Beryl, Al2Be3Si6O18

Beryl, Al2Be3Si6O18, is another beautifully crystalline aluminium mineral. It is hexagonal (hohohedral; a:c = 1:0.4989); hardness, 7.5; density, 2.7. The pale green crystals known as aquamarine, and the dark green crystals known as emerald, are familiar as precious stones. Beryl has been synthesised by Hautefeuille and Perrey.

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