A Hydrothermal reaction of MoO3, NiCl2·6H2O, WO3 and H2O with a molar ratio of 1∶0.6∶1∶83.3 gives a rhombic-shaped black crystal [NiMo12O40H10{Ni(H2O)3}4]. It crystallizes in a tetragonal system with space group I41/amd and unit cell parameters a=b=1.5184
