The composition of beryl is

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${Be}_{3} {Al}_{2} {Si}_{6} O_{18}$

${KAlSi}_{3} O_{11} (OH)_{2}$

${Be}_{3} {Cr}_{2} {Si}_{6} O_{18}$

${KAlSi}_{3} O_{6}$

answer is B.

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Detailed Solution

${Be}_{3} {Al}_{2} {Si}_{6} O_{18},$ the chemical formula of beryl, is a mineral made of beryllium aluminium silicate. The well-known beryl variants are emerald and aquamarine. Beryl can naturally form large, meter-sized hexagonal crystals, however terminated crystals are exceedingly uncommon.

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