Abstract
Single (Gd and Pr) and mixed rare earth (Di—a mixture of four rare earths La, Pr, Nd & Sm) heptamolybdates grow as platelet, multifacetted crystals and spherulites when corresponding rare earth chloride ions are made to react with ammonium paramolybdate. Various spherulitic formations are illustrated. It is shown that the spherulitic formations may be due to either fibres radially diverging from multiple nuclei or agglomeration of tiny crystallites orienting and accommodating themselves in a spherical space or intergrowth of multiple crystals which may include multiple twinning of interpenetrating type.
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