Abstract
THE structure of compounds A2IIMo3IVO8, where AII may be Mg, Mn, Fe, Co, Ni, Zn, and Cd, has been reported1. In this structure the divalent cations occupy both tetrahedral and octahedral holos. The arrangement leads to fairly large deviations from Pauling's electrostatic valence rule. Sums of strengths of the electrostatic bonds to oxygens range from as low as 2/3 to as high as ½, though the high figure applies to only two of the sixteen oxygens in the unit cell.
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