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Main provisions of the crystals theory:
Practical techniques:
Copper(II) sulfateCopper(II) sulfate, Artem PavlukovArtem PavlukovVKontakte
Potassium chloridePotassium chloride, Vladimir RomanivVladimir RomanivVKontakte
Magnesium-potassium sulfateMagnesium-potassium sulfate, Dmitry ShintyakovDmitry ShintyakovPersonal crystal growing collection