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Main provisions of the crystals theory:
Practical techniques:
Copper(II) sulfateCopper(II) sulfate, Artem PavlukovArtem PavlukovVKontakte
Iron(II) sulfateIron(II) sulfate, Gleb VertyankinGleb VertyankinVKontakte
Aluminum-potassium sulfateAluminum-potassium sulfate, Dmitry ShintyakovDmitry ShintyakovPersonal crystal growing collection
Chromium(III)-potassium sulfateChromium(III)-potassium sulfate, Rostislav DolgikhRostislav DolgikhVKontakte
SulfurSulfur, J sum1J sum1Sciencemadness forum
Physical properties of crystals. J.Nye