gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1983.047.344.13 New IR and XRD Data for Leadhillite of Ideal Composition Russell J. D. Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ Milodowski A. E. * Department of Geology, King’s College, Strand, London WC2R 2LS Fraser A. R. Clark D. R. Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ

Present address: IGS Environmental Protection Unit, Bldg 151, Harwell Laboratory, Oxfordshire OXll 0RA.

 9 1983 47 344 371 375 8 9 1982 Copyright © 1983, The Mineralogical Society 1983 Abstract

The infra-red spectrum and X-ray powder pattern of a chemically analysed specimen of leadhillite, a lead carbonate sulphate hydroxide mineral from Leadhills, Scotland, are shown to be different from those in the literature. The IR spectra of several specimens suggest that mutual replacement of SO4, CO3, and OH may occur in this mineral, and it is thought that this might be responsible for the observed variation in X-ray spacings.