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The role of titanium and the effect of TiO2 on the cell-size, refractive index, and specific gravity in the andradite-melanite-schorlomite series

Published online by Cambridge University Press:  14 March 2018

R. A. Howie  and
A. R. Woolley
R. A. Howie
Affiliation:
Department of Geology, King's College, London, W.C.2
A. R. Woolley
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London, S.W. 7
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Summary

New chemical analyses, cell-sizes, and specific gravities are given for 12 garnets, and TiO2 values, cell-sizes, and refractive indices are presented for a further 33 garnets all belonging to the andradite-melanite-schorlomite series. The increase of refractive index, cell-size, and specific gravity with increasing titania is shown graphically. A plot of Ti against Si atoms in the unit cell suggests that Ti replaces Si rather than Fe3+ in the structure, while electron-probe results indicate that Si or (Si+Fe) may be replaced by Ti. The chemical and infra-red absorption data are considered in a discussion of the structural role of titanium in these garnets : both Ti4+ and Ti3+ may be present.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 282 , June 1968 , pp. 775 - 790
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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