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Crichtonite, a distinct species

Published online by Cambridge University Press:  05 July 2018

M. H. Hey ,
P. G. Embrey  and
E. E. Fejer
M. H. Hey
Affiliation:
Department of Mineralogy, British Museum (Natural History), London, S.W. 7
P. G. Embrey
Affiliation:
Department of Mineralogy, British Museum (Natural History), London, S.W. 7
E. E. Fejer
Affiliation:
Department of Mineralogy, British Museum (Natural History), London, S.W. 7
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Summary

Confusion over the status of crichtonite is due to the fact that de Bournon included two different minerals in his species: thin hexagonal plates are indeed ilmenite, as has been generally assumed, but the much rarer steep rhombohedra with basal plane are a separate species, with a distinctive X-ray powder pattern (three strongest lines: 3·39 Å,s; 2·875,s; 2·131,S) and a composition (Fe2+,Fe3+,Ti)1·71O3 with Fe2+:Fe3+:Ti near 8:7:33. There is a rhombohedral pseudo-cell containing three oxygens, with α 23° 19′, a 7·117 Å but there is some evidence of twinning, and the true symmetry is probably orthorhombic or lower.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 287 , September 1969 , pp. 349 - 356
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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References

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