CBSE Class 12-science Answered

If two of the oxygens are shared and the structure is arranged in a ring, such as that shown here, we get the basic structural unit of the cyclosilcates or ring silicates.  Shown here is a six membered ring forming the structural group Si₆O₁₈^-12.  Three membered rings, Si₃O₉^-6, four membered rings, Si₄O₁₂^-8, and five membered rings Si₅O₁₅^-10are also possible.  A good example of a cyclosilicate is the mineral Beryl Be₃Al₂Si₆O₁₈.

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