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Vitusite — an apatite derivative structure

Published online by Cambridge University Press:  05 July 2018

Adrian A. Finch  and
James G. Fletcher
Adrian A. Finch
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen, AB9 2UE, U.K. Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh, EH9 3JW, U.K.
James G. Fletcher
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen, AB9 2UE, U.K.
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Abstract

The uncommon sodium rare-earth phosphate mineral vitusite-(Ce) (Na3RE(PO4)2) can be considered as the extreme product of sodium and rare-earth substitution in the apatite structure. Lesser amounts of substitution provide sodium and rare-earth-bearing apatites up to about 80 mol.% exchange; beyond this point vitusite is the stable phase. The structure of vitusite, determined previously from a synthetic analogue, can also be considered as a derivative from apatite, but with cations exchanged on sites normally occupied by anions. Vitusite can therefore be considered as a sodium- and rare-earthrich apatite end-member, with a distinct, but apatite-derived, structure, formed in highly persodic and high rare-earth environments. From an examination of the literature on diffusion in apatite, vitusite in principle could be formed from apatite sensu stricto by subsolidus diffusion in response to late-stage Naand RE-rich hydrothermal fluids.

Keywords

vitusiteapatiteIlímaussaqGardarSouth Greenland
Type
Crystal Structure
Information
Mineralogical Magazine , Volume 56 , Issue 383 , June 1992 , pp. 235 - 239
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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