A previously-reported cerium-rich vesuvianite from San Benito County, California, was reinvestigated using powder diffraction, single-crystal X-ray, and electron microprobe techniques. The material was shown to be a variety of vesuvianite with space group P4/nnc, a = 15.631−15.932, с = 11.858−11.896A, Z = 4. Uniaxial negative, ε = 1.723−1.756, ω = 1.741−1.763. Gmeas = 3.564−4.074. Chemical analyses show the mineral to correspond to a generalized vesuvianite formula, (Ca,RE)19−x(Mg,Fe3+Mn,Ti,Al)13−ySi18(O,OH)76, with slight site deficiencies due to the presence of abundant rare-earths.

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First page of New data on cerian vesuvianite from San Benito County, California
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