Abstract. CaSO4 (Berchtesgaden, Germany): orthorhombic, Bmmb, a = 6"992 (1), b = 6.999 (1), c = 6-240 (1) /~, Z=4, Dx=2"96 g cm -3. Refinement with diffractometer data yielded a final R value of 0.021. The two independent S-O bond lengths are 1.474 (2) and 1.475 (2)/k.Introduction. Intensities were collected from a cubeshaped crystal (edge length about 0.12 mm) with a Rigaku automated four-circle diffractometer and Mo K~ radiation monochromatized by a graphite plate. The co-20 scan technique was employed with a scan speed of 2 ° rain -I in o9. In all, 266 independent reflexion data were obtained within the range 20 < 70 °. Intensities were corrected for Lorentz and polarization

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