Abstract
Previous studies of synthetic gadolinite, Fe+2Y2Be2Si2O10, by the writer (1965, 1966) have demonstrated that this mineral can form numerous solid solution series involving the replacement of Fe2+ and Y3+ by other divalent and trivalent metals respectively. The crystallographic properties and chemical stabilities of the resulting synthetic phases were also shown to vary systematically with the ionic radii of the elements involved in these substitutions. These investigations have now been extended to include the calciogadolinites.
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