Iron(II) sulfate or ferrous sulfate is the chemical compound with the formula FeSO4. Known since ancient times as copperas and as green vitriol, the blue-green heptahydrate is the most common form of this material. ferrous sulfate is mainly used as a precursor to other iron compounds. It is a reducing agent, mostly for the reduction of chromate in cement.
Specification Of Ferrous Sulphate, Hepta hydrate ( Feso4.7H2O)

1) Apperance - free flowing bluish green crystals
2) Assay- 98 % Min
3) Ferric sulphate - 0.2 max
4) pH (5 % w/w solution ) at RT - 2.7 to 3.5
5) Moisture - 44 -46 %
6) Chloride - 0.005 % max
7) Lead- 0.005% max
8) Potassium- 0.05% max
9) Sodium - 0.05% max

Uses:

Nutritional supplement, Colorant, horticulture, animal feed, jewelry,