Hostname: page-component-77c89778f8-gq7q9 Total loading time: 0 Render date: 2024-07-24T02:47:22.191Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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.

References

Font-Altaba, (M.), 1960. Min. Mag., vol. 32, p. 567.Google Scholar
Gutt, (W.) and Smith, (M. A.), 1966. Nature, vol. 210, p. 408.CrossRefGoogle Scholar
[Kostov, (I.), Breskovska, (V.), Mincheva-Stefanova, (I.), and Kirov, (G. N.)] 1964. (The minerals of Bulgaria). Sofia, p. 243.Google Scholar
Lyon, (R. J. P.), 1962. Nature, vol. 196, p. 266.CrossRefGoogle Scholar
Moenke, (H.), 1964. Naturwiss., vol. 51, p. 239.CrossRefGoogle Scholar
Schwarcz, (H. P.) and Speelman, (E. L.), 1965. Amer. Min., vol. 50, p. 656.Google Scholar
Sclar, (C. B.), 1962. Science, vol. 138, p. 525.Google Scholar
[Stishov, (S.) and Belov, (N. V.)] 1962. (Compt. Rend. Acad. Sei. URSS), vol. 143, p. 951.Google Scholar
Weir, (C. E.) and Lippincott, (E. R.), 1961. Journ. Res. Nat. Bur. Stand., vol. 65A, p. 173.Google Scholar
Welin, (E.), 1956. Arkiv. Min. Geol., vol. 2, p. 137.Google Scholar
[Zhabin, (A. G.)] 1957. (Proe. Moscow Geol. Explor. Inst.), vol. 31, p. 134.Google Scholar