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Main provisions of the crystals theory:
Practical techniques:
Iron(II) sulfateIron(II) sulfate, Viktoriya ShipovaViktoriya ShipovaVKontakte
Iron(II)-ammonium sulfateIron(II)-ammonium sulfate, Maxim MartinovMaxim MartinovVKontakte
Magnesium-potassium sulfateMagnesium-potassium sulfate, Dmitry ShintyakovDmitry ShintyakovPersonal crystal growing collection