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On the infra-red spectrum and thermal decomposition products of thaumasite1, Ca3H2(CO3/SO4)SiO4.13H2O

Published online by Cambridge University Press:  14 March 2018

G. N. Kirov  and
C. N. Poulieff
G. N. Kirov
Affiliation:
Chair of Mineralogy and Crystallography, University of Sofia, Sofia, Bulgaria
C. N. Poulieff
Affiliation:
X-ray Laboratory, Geological Survey of Bulgaria
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Summary

The infra-red spectrum of untreated thaumasite Ca3H2(CO3/SO4)SiO4.13H2O, as well as the spectra and X-ray diffraction patterns of thaumasite heated in air at 200, 360, 550, 725, 800, 900, and 1150° C were investigated. The release of CO2 and H2O upon heating was followed. It was established that thaumasite changes between 200 and 550° C to a glass-like, amorphous state. Ca2SiO4-polymorphs and anhydrite are formed upon heating at temperatures up to 800° C. From 900° C calcium silicosulphate and anhydrite are the thermal decomposition products. These results are used in the assignment of the IR-absorption bands under 1400 cm−1 of untreated thaumasite, which are shown to be of a composite nature, i.e. attributable to overlapping vibrations of both sulphate and silicate tetrahedra.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 283 , September 1968 , pp. 1003 - 1011
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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Footnotes

2

Present address: Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 13, Bulgaria.

1

This paper was presented in part at the Seventh I.U.Cr. Congress in Moscow, July 1966.

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