Articles | Volume 35, issue 2
https://doi.org/10.5194/ejm-35-295-2023
https://doi.org/10.5194/ejm-35-295-2023
Research article
 | 
25 Apr 2023
Research article |  | 25 Apr 2023

Manganrockbridgeite, Mn2+2Fe3+3(PO4)3(OH)4(H2O), a new member of the rockbridgeite group, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria

Ian E. Grey, Rupert Hochleitner, Anthony R. Kampf, Stephanie Boer, Colin M. MacRae, John D. Cashion, Christian Rewitzer, and William G. Mumme

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Cited articles

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Elliott, P., Kolitsch, U., Giester, G., Libowitzky. E., McCammon, C., Pring, A., Birch, W. D., and Brugger, J.: Description and crystal structure of a new mineral – plimerite, ZnFe43+(PO4)3(OH)5 – the Zn-analogue of rockbridgeite and frondelite, from Broken Hill, New South Wales, Australia, Mineral. Mag., 73, 131–148, 2009.  
Farrugia, L. J.: WinGX suite for small-molecule single-crystal crystallography, J. Appl. Crystallogr., 32, 837–838, 1999. 
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Gagné, O. C. and Hawthorne, F. C.: Comprehensive derivation of bond-valence parameters for ion pairs involving oxygen, Acta Crystallogr. B, 71, 562–578, 2015. 
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Short summary
Manganrockbridgeite, Mn2+2Fe3+3(PO4)3(OH)4(H2O), a new member of the rockbridgeite group, has been characterised using electron microprobe analyses, Mössbauer spectroscopy, optical properties and single-crystal X-ray diffraction. Whereas other rockbridgeite-group minerals have orthorhombic symmetry with a statistical distribution of 50%Fe3+/50% vacancies in M3-site octahedra, monoclinic manganrockbridgeite has full ordering of Fe3+ and vacancies in alternate M3 sites along the 5.2 Å axis.
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