Occurrence of Metals


In earth?s crust availability of different elements varies like Al (8.3%) is most abundant followed by Fe (second most abundant).

 

Following table describes the principal ores of Al, Fe, Cu and Zn.

 

 

Principal Ores of Some Important Metals

Metal

Ores

Composition

Aluminium

Bauxite, Kaolinite (a form of clay)

AlOx(OH)3 - 2x

[Where 0 < x < 1]

Iron

Haematite

Magnetite

Siderite

Iron pyrites

 

 

Fe2O3

Fe3O4

FeCO3

FeS3

Copper

Copper pyrites

Malachite

Cuprite

CuFeS2

CuCO3.Cu(OH)2

Cu2O

Zinc

Zinc blende or Sphalerite

Calamine

Zincite

 

Zns

ZnCO3

ZnO