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Tapiolite, its chemistry and cell dimensions

Published online by Cambridge University Press:  05 July 2018

A. M. Clark
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD
E. E. Fejer
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD

Summary

Electron-probe analyses and cell dimensions are reported for twenty members of the tapiolite group. The minerals can be placed in ordered and disordered structural groups, the latter with a significantly larger c dimension. The a and c dimensions for both groups are dependent mainly on their titanium contents. The disordered set form part of a discontinuous series through strüverite/ilmenorutile to rutile. The chemical and structural data are incompatible with the existence of ferrotantalite or mossitc as valid species.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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References

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