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Zincoberaunite, ZnFe3+ 5(PO4)4(OH)5⋅6H2O, a new mineral from the Hagendorf South pegmatite, Germany

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Abstract

The new mineral zincoberaunite, ideally ZnFe3+ 5(PO4)4(OH)5·6H2O, the Zn analogue of beraunite, is found in the Hagendorf South granitic pegmatite, Hagendorf, Bavaria, Germany, in two associations: (1) with potassium feldspar, quartz, jungite, phosphophyllite and mitridatite (the holotype) and (2) with flurlite, plimerite, Zn-bearing beraunite, schoonerite, parascholzite/scholzite, robertsite and altered phosphophyllite (the cotype). Zincoberaunite occurs as radial or randomly oriented aggregates of flexible fibers up to 1.5 mm long and up to 3 μm thick. D calc is 2.92 g/cm3 for the holotype and 2.94 g/cm3 for the cotype. Zincoberaunite is optically biaxial (–), α = 1.745(5), β = 1.760(5), γ = 1.770(5), 2V meas = 80(5)°. Chemical composition of the holotype (electron probe microanalyser; H2O by gas chromatography of ignition products) is: MgO 0.28 wt%, CaO 0.47 wt%, ZnO 7.36 wt%, Al2O3 0.88 wt%, Fe2O3 42.42 wt%, P2O5 31.63 wt%, H2O 16.2 wt%, total 101.1 wt%. The empirical formula calculated on the basis of 27 oxygen atoms per formula unit is (Zn0.83Ca0.08Mg0.06)∑0.97(Fe3+ 4.88Al0.16)∑5.04(PO4)4.09(OH)4.78 · 5.86H2O. Zincoberaunite is monoclinic, space group C2/c; refined unit cell parameters (for the holotype at room temperature and the cotype at 100 K, respectively) are: a 20.837(2) and 20.836(4), b 5.1624(4) and 5.148(1), c 19.250(1) and 19.228(4) Å, β 93.252(5) and 93.21(3)°, V 2067.3(3) and 2059.2(7) Å3, Z = 4. The crystal structure of the holotype specimen has been refined by the Rietveld method (R p = 0.30 %; R B = 0.18 %) whereas the structure of the cotype has been solved from the single crystal data and refined to R 1 = 0.056 based on 1900 unique reflections with I > 2σ(I). The strongest reflections of the powder X-ray diffraction pattern of the holotype specimen [(d, Å) (I, %) (hkl)] are: 10.37 (100) (200), 9.58 (32) (002), 7.24 (26) (20–2), 4.817 (22) (111), 4.409 (13) (112), 3.483 (14) (11–4, 600), 3.431 (14) (404), 3.194 (15) (006, 31–4), 3.079 (33) (314).

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Acknowledgments

This study was supported by the Russian Foundation for Basic Research, grant no. 14-05-00276-a. The technical support by the SPbSU X-Ray Diffraction Research Resource Center in the XRD powder-diffraction studies is acknowledged.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia

    Nikita V. Chukanov

  2. Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119991, Russia

    Igor V. Pekov

  3. CSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria, 3169, Australia

    Ian E. Grey & Colin M. MacRae

  4. Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria, 3168, Australia

    Jason R. Price

  5. Department of Crystallography, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034, St. Petersburg, Russia

    Sergey N. Britvin & Maria G. Krzhizhanovskaya

  6. Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA, 90007, USA

    Anthony R. Kampf

  7. Kemmathen 42, 91355, Hiltpoltstein, Germany

    Bernhard Dünkel

  8. Algunderweg 3, D-92694, Etzenricht, Germany

    Erich Keck

  9. Fersman Mineralogical Museum of Russian Academy of Sciences, Leninsky Prospekt 18-2, Moscow, 119071, Russia

    Dmitry I. Belakovskiy

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  1. Nikita V. Chukanov
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  2. Igor V. Pekov
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  3. Ian E. Grey
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  7. Anthony R. Kampf
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  10. Dmitry I. Belakovskiy
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  11. Colin M. MacRae
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Correspondence to Nikita V. Chukanov.

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Editorial handling: A. Korsakov

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Chukanov, N.V., Pekov, I.V., Grey, I.E. et al. Zincoberaunite, ZnFe3+ 5(PO4)4(OH)5⋅6H2O, a new mineral from the Hagendorf South pegmatite, Germany. Miner Petrol 111, 351–361 (2017). https://doi.org/10.1007/s00710-016-0482-y

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