gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1965.034.268.23 Calculation of the C.I.P.W. Norm Kelsey C. H. Department of Mineralogy and Petrology, Cambridge 1965 34 268 276 282 Copyright © 1965, The Mineralogical Society 1965 Summary

A modification of the rules for the calculation of C.I.P.W. norms when no normative quartz is present is suggested.