Experimental data on solubility in the system MgSO4-NiSO4-H2O at 25 degrees
C were obtained by determining the saturation temperatures of solutions wit
h known composition by microscopic observation of the growth and dissolutio
n of test crystals. The unit cell parameters of mixed (Mg1-xNix)SO4.7H(2)O
crystals were determined in relation to their composition.