gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1973.039.304.11 Tungsten- and Antimony-Substituted Rutile Graham J. Morris R. C. CSIRO, Division of Mineralogy, Private Bag, P.O., Wembley, Western Australia, 6014 Government Chemical Laboratories, Plain Street, Perth, Western Australia, 6000 12 1973 39 304 470 473 1 1 1973 Copyright © 1973, The Mineralogical Society 1973 Summary

Two occurrences of rutile are reported from Big Bell in Western Australia containing up to 5·8 wt % WO3, 1·7 wt % Sb2O5, and 1·7 wt % FeO. One occurs in a mica schist, and the other in a pegmatite, and both contain a fine intergrowth of ilmenite lamellae. Small grains of gudmundite are associated with the rutile in the pegmatite. Microprobe analyses do not conclusively establish the mechanism of isomorphous substitution.