In the course of a study of garnets containing trivalent ions of the first transition series, Ca3V2Si3O12 was prepared hydrothermally at 530° and 3.0 kilobars, in a 30-day run at the oxygen partial pressure of the hema-tite-magnetite buifer. The starting material was glass with a Ca: V ratio of 3:2, but with excess silica to suppress the substitution of (OH)44− for SiO44−. Garnet was obtained in theoretical yield, as a dark green equi-granular powder, with n 1.834 ± 0.003, a 12.070 ± 0.005, and Dcalc 3.765.

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