Which of the following silicate is called amphibole ?

Single-chain silicate.

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Double-chain silicate.

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2D silicate

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Cyclic silicate.

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Solution

The correct option is D Double-chain silicate.
Double chain silicates are called amphiboles.

They contain double strand cross linked chains of composition $(S i_{4} O_{11})_{n}^{6 -}$ in which two simple chains are joined together through the third oxygen atom of the silicon tetrahedra $(S i O_{4})^{4 -}$ .

Example include Asbestos $C a_{2} M g_{5} (O H)_{2} (S i_{4} O_{11})_{2}$

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