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Thermal reactions of leadhillite Pb4SO4(CO3)2(OH)2

Published online by Cambridge University Press:  09 July 2018

A. E. Milodowski  and
D. J. Morgan
A. E. Milodowski
Affiliation:
British Geological Survey, Geochemistry Directorate, Keyworth, Nottingham NG12 5GG
D. J. Morgan
Affiliation:
64-78 Gray's Inn Road. London WC1X 8NG
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Abstract

Reactions undergone by leadhillite from the type locality on heating to 1000°C have been followed by DTA, TG, DSC, evolved gas analysis, continuous-heating XRD and IR, and hot-stage microscopy. Intermediate decomposition products were identified by X-ray powder photography. At 80°C, biaxial leadhillite inverts to a uniaxial phase with properties similar to those of susannite, a naturally occurring polymorph of leadhillite, but this higher-temperature modification only partially reverts to the original structure on cooling (up to 24 hours at room temperature is required for complete reversion). Between 250 and 600°C the mineral undergoes two decomposition reactions: PbO.PbCO3 and PbO.PbSO4 form during the first reaction (PbCO3 may form in the initial stages) and 4PbO.PbSO4 during the second. α-2PbO.PbSO4 appears at 650°C due to solid-state reaction between the other lead oxysulphate products. Melting occurs above 850°C. The reaction products are discussed in relation to the phase diagrams for the systems PbO-CO2 and PbO-PbSO4.

Type
Research Article
Information
Clay Minerals , Volume 19 , Issue 5 , December 1984 , pp. 825 - 841
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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