Following are the examples of silicate minerals
I) $Z i r c o n : Z r S i O_{4}$
II) $B e r y l : B e_{3} A l_{2} S i_{6} O_{18}$
III) $P y r o p h y l i t e : A l_{2} {(O H)}_{2} [S i_{2} O_{5}]$
The correct structural description of the minerals

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I — Ortho silicate; II — Cyclic silicate; III — Sheet silicate

I — Ortho silicate; II — Sheet silicate; III — Cyclic silicate

I — Cyclic silicate; II — Sheet silicate; III — Ortho silicate

I — Sheet silicate; II — Ortho silicate; III — Cyclic silicate

answer is A.

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Detailed Solution

Ortho silicate $S i O_{4}^{- 4}$ , Cyclic silicate ${(S i O_{3})}_{n}^{- 2 n}$
Sheet silicate ${(S i_{2} O_{5})}_{n}^{- 2 n}$

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