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Synthesis of aenigmatite

Published online by Cambridge University Press:  05 July 2018

R. N. Thompson  and
J. E. Chisholm
R. N. Thompson
Affiliation:
Department of Geology, The University, Manchester 13
J. E. Chisholm
Affiliation:
Department of Geology, The University, Manchester 13
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Summary

Aenigmatite with the formula Na4[Fe10 2+Ti2]Si12O14 has been synthesized hydrothermally, at 700 °C and 1000 bars P H2O, from an oxide starting material. The oxygen fugacity was controlled by means of an iron-wüstite buffer. An indexed X-ray powder pattern of synthetic aenigmatite is given, together with comparative data on two natural samples. One of the aenigmatites, from Kola, U.S.S.R., is known to be triclinic (Kelsey and McKie, 1964). The powder patterns of this and the synthetic aenigmatite are so similar that it is concluded that the latter is also triclinic, at least at room temperature.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 286 , June 1969 , pp. 253 - 255
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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References

Ernst, (W. G.), 1962. Journ. Geol. 70, 689.10.1086/626866CrossRefGoogle Scholar
Hamilton, (D. L.) and Henderson, (C. M. B.), 1968. Min. Mag. 36, 832.Google Scholar
Kelsey, (C. H.) and McKie, (D.), 1964. Ibid., 33, 986.10.1180/minmag.1964.033.266.06CrossRefGoogle Scholar