Beryl
Al 2%, Be 3%, O 18%, Si 6%,

estimated elemental composition and molecular weight 
Minerals with the same name may vary widely in appearance and composition, and very few are >99% (reagent grade) pure.

Gram formula weight (molecular mass) = 537.50


Minerals may vary in elemental composition and impurity levels.
Wikipedia Page:

Beryl
is defined with respect to the entities below:
The entities below are defined with respect to:
Beryl
Mineral (generic)


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