The following information is from the website:- http://en.wikipedia.org/wiki/Beryl
The mineralberyl is a berylliumaluminiumcyclosilicate with the chemical formula Be3Al2(SiO3)6. The hexagonalcrystals of beryl may be very small or range to several meters in size. Terminated crystals are relatively rare. Pure beryl is colorless, but it is frequently tinted by impurities; possible colors are green, blue, yellow, red, and white.
The hardness (Mohs scale) : 7.5 - 8.0
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