The structure of a pyroxene of approximate formula Ca (Mg,Fe3+,Fe2+,Ti,Al) (Si,Al)2O6 having approximately 25 percent of the tetrahedrally coordinated sites occupied by A1 has been refined using the least-squares method, and utilizing proportional counter data, to R = 6.7%. Ordering of cations is complete within the accuracy of the data with Ca in the MII site and only Al substituting for Si. Isotropic temperature factors fall within the range for structures of this general type where no solid solution occurs.

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