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X-ray diffraction and magnetic studies of altered ilmenite and pseudorutile

Published online by Cambridge University Press:  05 July 2018

M. J. Wort  and
M. P. Jones
M. J. Wort
Affiliation:
Department of Mineral Resources Engineering, Royal School of Mines, London SW7 2BP
M. P. Jones
Affiliation:
Department of Mineral Resources Engineering, Royal School of Mines, London SW7 2BP
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Synopsis

IT was not until 1966 that pseudorutile was first defined. Earlier, its X-ray diffraction spectrum had been confused with that of futile and, to a lesser degree, with those of hematite and ilmenite. Subsequent work has shown that pseudorutile has a world-wide distribution in detrital ilmenite-bearing heavy mineral deposits. The present work has confirmed its magnetic susceptibility and density. In addition pseudorutile is shown to be a magnetic spin glass with a peak susceptibility at 23 °K.

Altered ilmenites, in which pseudorutile occurs as a secondary alteration product, display a range of chemical composition and magnetic susceptibility. The most highly magnetic fractions are not necessarily those containing the least-altered ilmenite, and in material from Capel, Western Australia, the most highly magnetic fractions were those containing grains of ferrimagnetic ferrian ilmenite.

Quantitative X-ray diffraction has shown that West Australian altered ilmenite contains significant amounts of amorphous ilmenite, pseudorutile, and rutile. The magnetic susceptibility of paramagnetic fractions of altered ilmenite from Capel, Western Australia, can be calculated from normative compositions based on chemical analyses.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 329 , March 1980 , pp. 659 - 663
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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