structure of cyclic  silicate and double chain silicate 

Cyclic silicates are formed when three or more tetrahedral SiO44- units linked cyclically. They mainly contain (SiO3)n2n- ions. Every unit shares two oxygen atoms with other units. 

Double chain silicates are also called as Amphiboles. The general formula is (Si4O11)n6n- .  Ex., Asbestos and Tremolite 


 

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