The symmetry and crystal structure of olivenite

Abstract

The symmetry of the intensity distribution of 1022 reflections of olivenite with 1 _> 0 was examined and the space group P2~/n determined. The unit-cell dimensions (with a as a unique axis) are: a = 8.615 (5), b -= 8.240 (5), c = 5.953 (4) A, ¢t = 90.0 (1) °. A least-squares refinement of the structure factors was performed successfully in this space group and the atomic coordinates determined. Weighted R residuals of 0.090 and 0.065 were obtained for refinements where twinning on the (010) plane was ignored and corrected for respec tively. The monoclinic structure deviates only moderately from the approximate orthorhombic structure (largest displacement = 0.33 A) as determined by Heritsch IZ. Kristallogr. (1938), 99, 466-4791.