gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1959.032.244.05 Some Further Heating Experiments on Natural Titaniferous Magnetites Wright J. B. B.A., B.Sc., F.G.S. Department of Geology and Mineralogy, University Museum, Oxford.1

Present address: Mines and Geological Department, P.O. Box 30009, Nairobi, Kenya.

 3 1959 32 244 32 37 Copyright © 1959, The Mineralogical Society 1959 Summary

Samples of magnetite containing exsolution bodies of ilmenite, or of ulvöspinel and ilmenite, were heated at 1,250–1,300° C. under oxidizing and under reducing conditions.

In the former case, the product consisted of magnetite, ferri-ilmenite, and pseudobrookite. In the latter, loss of oxygen converted a magnetite-ilmenite intergrowth into a homogeneous Fe3O4-Fe2TiO4 spinel solid solution, while a magnetite sample originally carrying ulvöspinel in addition to ilmenite yielded a spinel phase with surprisingly low cell dimension, together with some metallic iron.