I have a process for the making stannous sulfate (SnSo4) as folllow

First prepared a SnCl2 by Sn + 2HCl and then SnCl2 solution to be added NaOH after that filter washed and the cake dissolved in diluted Sulfuric acid so obtained SnSO4 in dissolve form, when we add conc, H2SO4, SnSO4 precipitated out, purity of SnSO4 is OK but i get in powder form i want to make in crystal form. 

Any one has idea on how I can make crystals of SnSO4?

Regards

Dr. Mahesh

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