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Aluminium-bearing strunzite derived from jahnsite at the Hagendorf-Süd pegmatite, Germany
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- Journal:
- Mineralogical Magazine / Volume 76 / Issue 5 / October 2012
- Published online by Cambridge University Press:
- 05 July 2018, pp. 1165-1174
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- Article
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Aluminium-bearing strunzite, [Mn0.65Fe0.26Zn0.08Mg0.01]2+[Fe1.50Al0.50]3+(PO4)2(OH)2·6H2O, occurs as fibrous aggregates in a crystallographicallyoriented 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 observedreflections. 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-chemicalcomparison 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.
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