A single-crystal X-ray diffraction study of synthetic pseuowollastonite (CaSiO 3 ) shows that this crystal has monoclinic C2/c symmetry, with a = 6.8394(5), b = 11.8704(9), c = 19.6313(7) Aa, beta = 90.667(6) degrees , and V = 1593.7(2) Aa 3 . Basic features of the C2/c structure are similar to those previously determined with a C 1 symmetry but fewer sites exist for the monoclinic space group: five symmetrically nonequivalent Ca sites, three Si sites, and nine O sites.

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