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Discuss the ortho and pyro silicates. |
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Answer» Solution :ORTHO silicate: The simplest which contain discrete `[SiO_(4)]^(4-)` tetrahedral units are called ortho SILICATES or neso silicates. Examples: Phenacite `-Be_(2)SiO_(4)(be^(2+)` ions are tetrahedrally surrounded by `O^(2-)` ions) , Olivine- `(Fe//Mg))_(2)SiO_(4)` (`Fe^(2+)` and `Mg^(2+)` cations are octahedrally surrounded by `O^(2-)` ions). Pyro silicates: Silicates which contain `[Si_(2)O_(4)]^(6-)` ions are called pyro silicates (or ) Soro silicates. They are fomed by joining two `[SiO_(4)]^(4-)` tetrahedral units by sharing ONE oxygen atom at one corner: (one oxygen is removed while joining). Example: Thortveitite `-Sc_(2)Si_(2)O_(7)` 
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