gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1974.039.306.09 An E.S.R. Study of Natural Fluorite Containing Manganese Impurities Bailey A. D. 1 Hunt R. P. 2 Taylor K. N. R. 3

Now at University of Bath, England.

Now at CEGB Nuclear Research Laboratory, Berkeley, England.

Now at Physics Dept. University of N.S.W. Sydney, Australia.

 6 1974 39 306 705 708 10 4 1973 10 10 1973 Copyright © 1974, The Mineralogical Society 1974 Summary

The electron spin resonance spectrum of a sample of natural, orange-coloured fluorite from Broken Hill, Australia, has been observed and shown to arise from the presence of manganese ions. From an analysis of the structure of this spectrum it has been possible to estimate the various contributions to the ionic energy level splitting and to show that these are in good agreement with comparable results for synthetic material. It is evident that the manganese ions have entered the lattice substitutionally at Ca2+ sites and the nature of this site is discussed.