gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1964.033.267.04 Pumpellyite in Snowdonian Soils and Rocks Jenkins D. A. B.A., Ph.D. Dept. of Biochemistry and Soil Science, University College of North Wales, Bangor Ball D. F. M.A. The Nature Conservancy, Penrhos Road, Bangor 12 1964 33 267 1093 1096 Copyright © 1964, The Mineralogical Society 1964 Summary

Detrital grains, noted during the mineralogical examination of certain Snowdonian soils, have been identified as varieties of the mineral pumpellyite : the source of one variety has been located in dolerites exposed in the area, and the identity of this variety confirmed by X-ray analysis.