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Rewitzerite, K(H2O)Mn2(Al2Ti)(PO4)4[O(OH)](H2O)10⋅4H2O, a new monoclinic paulkerrite-group mineral, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany

Published online by Cambridge University Press:  24 July 2023

Ian E. Grey Open the ORCID record for Ian E. Grey [Opens in a new window] ,
Rupert Hochleitner Open the ORCID record for Rupert Hochleitner [Opens in a new window] ,
Anthony R. Kampf Open the ORCID record for Anthony R. Kampf [Opens in a new window] ,
Stephanie Boer Open the ORCID record for Stephanie Boer [Opens in a new window] ,
Colin M. MacRae ,
William G. Mumme  and
Erich Keck
Ian E. Grey*
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria 3169, Australia
Rupert Hochleitner
Affiliation:
Mineralogical State Collection (SNSB), Theresienstrasse 41, 80333, München, Germany
Anthony R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA
Stephanie Boer
Affiliation:
Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
Colin M. MacRae
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria 3169, Australia
William G. Mumme
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria 3169, Australia
Erich Keck
Affiliation:
Independent researcher, Algunderweg 3, D-92694, Etzenricht, Germany.
*
Corresponding author: Ian E. Grey; Email: ian.grey@csiro.au
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Abstract

Rewitzerite, K(H2O)Mn2(Al2Ti)(PO4)4[O(OH)](H2O)10⋅4H2O, is a new monoclinic member of the paulkerrite group, from the Hagendorf-Süd pegmatite, Oberpfalz, Bavaria, Germany. It was found in specimens of altered zwieselite, in association with rockbridgeite. Rewitzerite forms clusters of colourless elongated hexagonal-shaped prisms, up to 0.1 mm long. The crystals are flattened on {010} and elongated along [100], with forms {010}, {001}, {111} and {$\bar{1}$11}. The calculated density is 2.33 g⋅cm–3. Optically, rewitzerite crystals are biaxial (+), with α = 1.585(2), β = 1.586(2), γ = 1.615(2) (measured in white light) and 2V(meas) = 25(2)°. The empirical formula from electron microprobe analyses and structure refinement is A1[K0.77(H2O)0.23]A2[H2O] M1(Mn2+0.82Mg0.64Fe3+0.43□0.11)Σ2.00 M2+M3(Al1.51Ti4+1.06Fe3+0.43)Σ3.00(PO4)4 X[(OH)0.54F0.42O1.04]Σ2.00(H2O)10⋅4H2O, where □ = vacancy.

Rewitzerite has monoclinic symmetry with space group P21/c and unit-cell parameters a = 10.444(2) Å, b = 20.445(2) Å, c = 12.2690(10)Å, β = 90.17(3)°, V = 2619.8(6) Å3 and Z = 4. The crystal structure was refined using synchrotron single-crystal data to wRobs = 0.068 for 5894 reflections with I > 3σ(I). The crystal structure has the same topology as that for orthorhombic paulkerrite-group minerals but differs primarily in having an ordering of K+ and H2O molecules in different A sites, whereas they are disordered at a single A site in the orthorhombic members of the group.

Keywords

new mineralsynchrotron diffractionRaman spectroscopycrystal structurepaulkerrite group
Type
Article
Information
Mineralogical Magazine , Volume 87 , Issue 6 , December 2023 , pp. 830 - 838
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Associate Editor: Michele Dondi

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