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  Inorganic Chemistry

Classicification of SILICATES

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No. of corners of SiO4 tetrahe-dra shared

No. of com-mon oxygen atoms

Structure

Net cha-rge and Anion in the silicate structure

Example

Diagram and Description

Zero

Zero

                     Discrete.JPG

 Discrete SiO44–anion

Si = +4

O = – 8

Net = –4 SiO4–4

ortho-silicates Mg2SiO4

1

1

                      Island structure.JPG

 Island structure

Si = + 8

O = – 14

Net = –6

(Si2O7)6–

Pyro-

 silicates

2

2

Ring anion

Si= +12

O = –18

Net = –6

(Si2O9)6–

Wollas-tonite Ca3Si3O9

2

 

 

               Ring anion.JPG

Ring anion

Si =+24

O = –36

Net=–12

(Si6O18)12–

Beryl, Be3Al2 Si6O18

2

2

 

      Chain anion.JPG

 

Chain anion

Si = +4

O =   –6

Net = –2(SiO32–)n

Pyroxenes, e.g., MgCa   Si2O6 Asbestos

3

3

      Two dimensional sheet structure.JPG

Two dimensional sheet structure

Si = +8

O = –10

Net = –2

(Si2O2–5)n

Clays, talc kaolinite

4

4

–

Three dimensional network

Si = +4

O = –4

(SiO3)n

Quartz, Tridymite and Cristo-balite

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