Titre du document / Document title

Vitusite―an apatite derivative structure

Auteur(s) / Author(s)

FINCH A. A. ; FLETCHER J. G. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

Univ. Aberdeen, dep. chemistry, Old Aberdeen AB9 2UE, ROYAUME-UNI

Résumé / 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-earth-rich apatite end-member, with a distinct, but apatite-derived, structure, fortmed 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 Na- and RE-rich hydrothermal fluids

Revue / Journal Title

Mineralogical Magazine   ISSN 0026-461X   CODEN MNLMBB 

Source / Source

1992, vol. 56, n^o2, pp. 235-239 (23 ref.)

Langue / Language

Anglais

Editeur / Publisher

Mineralogical Society, London, ROYAUME-UNI  (1969) (Revue)

Mots-clés anglais / English Keywords

phosphates ; rare earths ; apatite ; substitution ; crystal chemistry ; sodium ; hydrothermal alteration ; Ilimaussaq ; South Greenland ; alkalic composition ; cation exchange capacity ;

Mots-clés français / French Keywords

Phosphate ; Terre rare ; Apatite ; Substitution ; Cristallochimie ; Sodium ; Altération hydrothermale ; Ilimaussaq ; Groenland Sud ; Composition alcaline ; Capacité échange cation ; Vitusite ; Site cristallographique ;

Mots-clés espagnols / Spanish Keywords

Fosfato ; Tierras raras ; Apatito ; Substitución ; Cristaloquímica ; Sodio ; Alteración hidrotermal ; Groenlandia del Sur ; Composición alcalina ; Capacidad intercambio catión ;

Localisation / Location

INIST-CNRS, Cote INIST : 3052, 35400002857499.0100