What is the structural difference between …
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Sia ? 2 years, 9 months ago
Pyrosilicates are silicates which contain Si2O76-. They are formed by joining two tetrahedral Si2O44-. When two Si2O44- are joined, there is removal of one oxygen atom and the two units join at the corner oxygen atom. Example is thortveitite, Sc2Si2O7. The structure of pyrosilicate is:
The reds are oxygen atoms and greens are silicon.
Cyclic silicates contains (SiO3)n2n- which are formed by linking three or more tetrahedral SiO44- units cyclically. Each SiO44- shares two oxygen atoms with other unit. Example is Benitoite, BaTi(SiO3)3. Here three SiO44- units are arranged cyclically.
<i>Orthosilicates: </i>In simple Orthosilicates the SiO4 4- tetrahedron units do not share any of its oxygen atoms with any of the other tetrahedra units. E.g. Willmenite ZnSiO4, Zircon ZrSiO4.
<i> </i><i>Pyrosilicates or Island silicates</i>
In Pyrosilicates one oxygen atom is shared by two silicate units General formula is (Si2O7)6-
E.g. Thortevitite Sc2[Si2O7] and Hemimorphite Zn(OH)2(Si2O7)H2O
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