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Discuss the ortho and pyro silicates.

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Ortho silicates: The simplest silicates which contain discrete [SiO4]4-  tetrahedral units are called ortho silicates or neso silicates. 

Examples: Phenacite – Be2SiO4 (Be2+) ions are tetrahedrally surrounded by O2- ions). Olivine – (Fe/Mg)2 SiO4 (Fe2+ and Mg2+ cations are octahedrally surrounded by O2- ions).

Pyro silicates: Silicates which contain [Si2O7]6- ions are called pyro silicates (or) Soro silicates They are formed by joining two [SiO4]4- tetrahedral units by sharing one oxygen atom at one comer, (one oxygen is removed while, joining).

Example: Thortveitite – SC2Si2O 7.

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