gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1979.043.327.13 Irregularities in Patterns of Element Partition Henderson Paul Department of Mineralogy, British Museum (Natural History), London SW 75BD 9 1979 43 327 399 404 7 9 1978 15 2 1979 Copyright © 1979, The Mineralogical Society 1979 Summary

In clinopyroxene-melt systems the distribution of chromium and vanadium ions departs from the general pattern of element partition as a function of ionic radius. These departures may be explained by crystal-field effects. Melt structure and the nature of the coordination of cations in the melt also help to determine the pattern of distribution and the extent of the departures from regularity.