Abstract
Ca 2GeO 4 of olivine form has been found to transform at 900°C and 110 kbars to K 2NiF 4 type, with a = 3.70, c = 11.88 Å, and with a corresponding density increase of 25%. The geochemical significance of this transformation is discussed, and a comparison of the molar volumes of olivines, spinels and other structure type with the volumes of their isochemical mixtures of simple oxides or fluorides is used to obtain relative molar volumes for a large number of dense M 3O 4 structure types.
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