## X-ray Determination of Centrosymmetry in three Felspars^{1}

S. W. Bailey, R. B. Ferguson and W. H. Taylor

Crystallographic Laboratory, Cavendish Laboratory, Cambridge

^{1}The substance of this paper was presented briefly during discussion at a special meeting of the Mineralogical Society devoted to felspars, May 16, 1951.

**Summary:** Three statistical tests, depending upon the probability distribution of X-ray intensities, have been applied to orthoclase, sanidine, and albite. It is concluded that these three felspars posses centres of symmetry, justifying the assumption of holohedral symmetry made in earlier structure analyses.