gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1973.039.301.06 Hematophanite, a Derivative of the Perovskite Structure1 Rouse R. C. 2 Department of Geology and Mineralogy, The University of Michigan, Ann Arbor, Michigan, U.S.A.

Contribution No. 307, The Mineralogical Laboratory, Department of Geology and Mineralogy, The University of Michigan.

Present address: Dept. of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560.

 3 1973 39 301 49 53 2 5 1972 Copyright © 1973, The Mineralogical Society 1973 Summary

Hematophanite, ideally Pb4Fe3O8Cl, is tetragonal, space group P4mm, with a = 3·92 and c = 15·31 Å. The crystal structure, which has been refined to an R-factor of 9·1 %, may be described as an interlayering of perovskite-like units with a cesium chloride or, alternatively, a nadoritelike unit. The nadorite-like part consists of a double layer of PbO4Cl4 distorted square antiprisms. Iron atoms are in 6-fold (tetragonal bipyramidal) and 5-fold (square pyramidal) coordination.