gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1967.036.277.05 The Crystal Structure of Gersdorffite Bayliss P. Stephenson N. C. School of Applied Geology, University of New South Wales, Australia, and School of Chemistry, University of New South Wales, Australia 3 1967 36 277 38 42 6 9 1966 Copyright © 1967, The Mineralogical Society 1967 Summary

Gersdorffite belongs to space group P213 in the cubic system with cell dimension a 5·6885 ± 0·0003 Å and four formula units per cell. The hk0 data were measured from precession photographs obtained with Mo-Kα radiation. The structure was solved by Patterson methods and refined by least-squares techniques. This structure has complete ordering of arsenic and sulphur similar to ullmannite.