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The origin of the hydrous scandium phosphate, kolbeckite, from the Hagendorf-Pleystein pegmatite province, Germany

Published online by Cambridge University Press:  05 July 2018

H.G. Dill ,
B. Weber ,
M. Füssl  and
F. Melcher
H.G. Dill*
Affiliation:
Federal Institute for Geosciences and Natural Resources, P.O. Box 510163, D-30631 Hannover, Germany
B. Weber
Affiliation:
Bürgermeister-Knorr Str. 8, D-92637 Weiden i.d.OPf., Germany
M. Füssl
Affiliation:
A.-v.-Humboldt-Str. 4, D-92711 Parkstein, Germany
F. Melcher
Affiliation:
Federal Institute for Geosciences and Natural Resources, P.O. Box 510163, D-30631 Hannover, Germany
*
*E-mail: dill@bgr.de
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Abstract

The rare hydrous scandium phosphate, kolbeckite, [Sc(PO4).2H2O], has been recognized for the first time from the Hagendorf-Pleystein pegmatite province. The mineral was formed by the alteration of quartz-rich relict cores of pegmatites containing rutile, ilmenite, columbite, pyrochlore, wolframite, monazite and apatite. The alteration process involved acidic meteoric water and was not related to low-temperature hydrothermal fluids. Scandium and phosphorous for the formation of the kolbeckite were provided by the decomposition of the primary oxides and phosphates, respectively. Hydrous Sc phosphates are considered to form only during advanced stages of weathering in Al- and Fe-poor environments. In Al- and Fe-rich environments Sc is scavenged from solution as a trace component of Al- and Fe phosphates. A special type of leucoxene containing Fe, Al and P was formed during the process of formation of kolbeckite. In the absence of phosphate anions, Sc is removed in solution and ‘normal’ leucoxene is formed.

Keywords

kolbeckitescandiumpegmatitesupergeneGermany
Type
Research Article
Information
Mineralogical Magazine , Volume 70 , Issue 3 , June 2006 , pp. 281 - 290
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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