gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1981.44.333.14 Högbomite of Unusual Composition from Reedy Creek, South Australia Mancktelow N. S. Department of Geology and Mineralogy, University of Adelaide, Adelaide 5000, Australia

Present address: Geologisches Institut, ETH-Zentrum, CH-8092 Zfirich, Switzerland.

 3 1981 44 333 91 94 27 5 1980 22 9 1980 Copyright © 1981, The Mineralogical Society 1981 Abstract

Högbomite from Reedy Creek, South Australia, is of a composition outside the previously reported range. It contains less Ti and Mg and more Al and total Fe, with a total Fe/(total Fe + Mg) value between 0.69 and 0.72. The högbomite occurs in unusual cordieritesillimanite aggregates containing minor magnetite, ilmenite, hematite, corundum, and hercynite.