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Aluminium-bearing strunzite derived from jahnsite at the Hagendorf-Süd pegmatite, Germany

Published online by Cambridge University Press:  05 July 2018

I. E. Grey ,
C. M. Macrae ,
E. Keck  and
W. D. Birch
I. E. Grey*
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
C. M. Macrae
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
E. Keck
Affiliation:
Algunderweg 3, D - 02694 Etzenricht, Germany
W. D. Birch
Affiliation:
Geosciences, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia
*
*E-mail: [email protected]
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Abstract

Aluminium-bearing strunzite, [Mn0.65Fe0.26Zn0.08Mg0.01]2+[Fe1.50Al0.50]3+(PO4)2(OH)2·6H2O, occurs as fibrous aggregates in a crystallographically oriented association with jahnsite on altered zwieselite samples from the phosphate pegmatite at Hagendorf Süd, Bavaria, Germany. Synchrotron X-ray data were collected from a 3 μm diameter fibre and refined in space group P to R1 = 0.054 for 1484 observed reflections. The refinement confirmed the results of chemical analyses which showed that one quarter of the trivalent iron in the strunzite crystals is replaced by aluminium. The paragenesis revealed by scanning electron microscopy, in combination with chemical analyses and a crystal-chemical comparison of the strunzite and jahnsite structures, are consistent with strunzite being formed from jahnsite by selective leaching of (100) metal—phosphate layers containing large divalent Ca and Mn atoms.

Keywords

Al-bearing strunzitestrunzite paragenesisstrunzite structure refinementHagendorf Süd secondary phosphates
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 5 , October 2012 , pp. 1165 - 1174
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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