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Jahnsite—whiteite solid solutions and associated minerals in the phosphate pegmatite at Hagendorf-Süd, Bavaria, Germany

Published online by Cambridge University Press:  05 July 2018

I. E. Grey ,
W. G. Mumme ,
S. M. Neville ,
N. C. Wilson  and
W. D. Birch
I. E. Grey*
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
W. G. Mumme
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
S. M. Neville
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
N. C. Wilson
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
W. D. Birch
Affiliation:
Geosciences, Museum Victoria, GPO Box 666, Melbourne 3001, Victoria, Australia
*
E-mail: [email protected]
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Abstract

Secondary phosphate assemblages from the Hagendorf Süd granitic pegmatite, containing the new Mn-Al phosphate mineral, nordgauite, have been characterized using scanning electron microscopy and electron microprobe analysis. Nordgauite nodules enclose crystals of the jahnsite—whiteite group of minerals, showing pronounced compositional zoning, spanning the full range of Fe/Al ratios between jahnsite and whiteite. The whiteite-rich members are F-bearing, whereas the jahnsite-rich members contain no F. Associated minerals include sphalerite, apatite, parascholzite, zwieselite-triplite solid solutions and a kingsmountite-related mineral. The average compositions of whiteite and jahnsite from different zoned regions correspond to jahnsite-(CaMnMn), whiteite-(CaMnMn) and the previously undescribed whiteite-(CaMnFe) end-members. Mo-Kα CCD intensity data were collected on a twinned crystal of the (CaMnMn)-dominant whiteite and refined in P2/a to wRobs = 0.064 for 1015 observed reflections.

Keywords

jahnsite—whiteite solid solutionsHagendorf pegmatitekingsmountite analoguenordgauitesecondary phosphate minerals
Type
Research Article
Information
Mineralogical Magazine , Volume 74 , Issue 6 , December 2010 , pp. 969 - 978
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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