gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1960.032.248.09 Thaumasite from Co. Down, Northern Ireland1 Diane C. Knill Ph.D., D.I.C. Young B. R. B.Sc. Geological Survey and Museum, London, S.W. 7.

Published by permission of the Director, Geological Survey and Museum.

 3 1960 32 248 416 418 Copyright © 1960, The Mineralogical Society 1960 Summary

Thaumasite has been found in a dolerite sill at Ballyalton, Co. Down, Northern Ireland. Indexed powder data for the mineral are given.