How many oxygen atoms are shared among the tetrahedron of a silicate anion in the mineral beryl?

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6.00

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6.0

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Solution

The chemical formula of beryl is $B e_{3} A l_{2} S i_{6} O_{18}$ . The cyclic structure of $S i_{6} O_{18}^{12 -}$ is:

So the number of $O$ -atoms shared among the tetrahedron is 6.

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