Unit-cell refinements of the K-rich phase of some strongly anomalous cryptoperthites from the Rattlesnake Mountain sill, West Texas, have been obtained. Compositions of the K-rich phases were estimated from the unit-cell volume, and bulk compositions were estimated from measured d(2̅01)s of the homogenized phases. Stepwise multiple linear regression analysis was selected to examine the relation between selected measured parameters and the unit-cell volume of the K-rich phase and d(2̅01) of the homogenized phase. Variables that add significantly to the prediction of the unit-cell volume are sensitive to the composition and distortion of the K-rich phase, and those that predict d(2̅01) are sensitive to the estimated order of the K-rich phase and the distortion of the K-rich phase.

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