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The Canadian Mineralogist; December 2007; v. 45; no. 6; p. 1389-1396; DOI: 10.3749/canmin.45.6.1389
© 2007 Mineralogical Association of Canada
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PINK LANTHANITE-(Nd) FROM WHITIANGA QUARRY, COROMANDEL PENINSULA, NEW ZEALAND

Ian T. Graham1,§, Ross E. Pogson2, David M. Colchester3, Janet Hergt4, Rod Martin5 and Peter A. Williams6

1 Geoscience, Australian Museum, 6 College Street, Sydney, NSW 2010, Australia, and School of Biological, Earth and Environmental Sciences, University of New South Wales, Kensington, NSW 2052, Australia
2 Geoscience, Australian Museum, 6 College Street, Sydney, NSW 2010, Australia
3 Geoscience, Australian Museum, 6 College Street, Sydney, NSW 2010, Australia, and School of Natural Sciences, University of Western Sydney, Locked Bag 1797, Penrith South DC, NSW 1797, Australia
4 School of Earth Sciences, University of Melbourne, Melbourne, VIC 3010, Australia
5 Glenfield, North Shore City, New Zealand
6 School of Natural Sciences, University of Western Sydney, Locked Bag 1797, Penrith South DC NSW 1797, Australia

§ E-mail address: i.graham{at}unsw.edu.au

Nous décrivons la lanthanite-(Nd) présente dans un agglomérat andésitique tuffacé altéré à la carrière de Whitianga, péninsule de Coromandel, en Nouvelle-Zélande. L’habitus en plaquettes habituel y est développé, ainsi qu’une morphologie plus inhabituelle en blocs. Les plaquettes montrent les formes {201}, {102} et {111}, et les cristaux en blocs, {111}. Les analyses effectuées par l’approche ICP–MS révèlent une distribution des terres rares (et Ga) qui concorde avec la formule (Nd0.63La0.59Ce0.35 Pr0.15Sm0.10Gd0.069Y0.06Eu0.03Dy0.02Ga0.01){sum} 2.04(CO3)3·8H2O; la somme des terres rares supérieure à 2.00 est due aux erreurs d’arrondi. Il s’agit du premier exemple de cette espèce rare en Nouvelle-Zélande. La lanthanite-(Nd) s’est formée en milieu relativemen oxydant. Les terres rares auraient été lessivées par de l’eau tiède circulant au travers des roches andésitiques sous-jacentes du Groupe de Manaia Hill. Nous nous sommes aussi servis de la diffraction X (méthode des poudres) et de la spectroscopie de Raman pour caractériser la lanthanite-(Nd).

(Traduit par la Rédaction)

Mots-clés: lanthanite-(Nd), terres rares, composition, diffraction X, spectroscopie de Raman, péninsule de Coromandel, Nouvelle- Zélande.





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