1.
Native elements
2.
Sulphides
3.
Sulpho-salts
4.
Haldies
5.
Oxides
6.
Hydroxides
7.
Carbonates
8.
Nitrates
9.
Borates
10. Sulphates
11. Chromates
12. Molybdates
13. Tungstates
14. Phosphates
15. Arsenates
16. Vanadates
17. silicates
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