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Zincovelesite-6N6S, Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH), a new högbomite-supergroup mineral from Jacupica mountains, Republic of Macedonia

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Abstract

A new mineral species zincovelesite-6N6S with the simplified formula Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH) was discovered in the orogenetic zone related to the “Mixed Series” metamorphic complex near the Nežilovo village, Jacupica Mountains, Pelagonia mountain range, Republic of Macedonia. In oxide Zn-Fe-Mn ore, zincovelesite-6N6S forms lenticular aggregates up to 2 × 2 × 0.5 mm consisting of thin near-coplanar platelets up to 70 × 70 × 1 µm3 and associated with franklinite, gahnite, hetaerolite, zincochromite, ferricoronadite, baryte, As-rich fluorapatite, dolomite, Zn-bearing talc, almeidaite, hydroxycalcioroméite, zircon, quartz, and scheelite. In silicate-baryte zones of the metasomatic rock, uniaxial intergrowths of zincovelesite-6N6S with nežilovite are observed. The new mineral is opaque, black, with brownish-black streak. The lustre is strong submetallic to metallic. The micro-indentation hardness is 1118 kg/mm2 which corresponds to Mohs’ hardness ca. 6½. Zincovelesite-6N6S is brittle, with uneven fracture. No cleavage or parting is observed. The density calculated from the empirical formula is 5.158 g/cm3. In reflected light zincovelesite-6N6S is light grey. The reflectance values [Rmax/Rmin, % (λ, nm)] are: 17.1/13.4 (470), 16.5/12.8 (546), 16.2/12.6 (589), 15.6/12.2 (650). The IR spectrum shows the presence of OH groups. According to the Mössbauer spectrum, all iron is trivalent. The Mn K-edge XANES spectroscopy shows that Mn is predominantly or completely trivalent. The average chemical composition is (wt%; electron microprobe, H2O determined by gas chromatography of ignition products): MgO 0.97, CuO 0.50, ZnO 30.80, Al2O3 8.17, Mn2O3 21.31, Fe2O3 29.44, TiO2 5.28, Sb2O5 3.74, H2O 1.1, total 101.31. The empirical formula based on 16 O atoms is H1.05Zn3.26Mg0.21Cu0.05Fe3+3.18Mn3+2.32Al1.38Ti0.57Sb0.20O16. Zincovelesite-6N6S is trigonal, probable space group P-3m1, a = 5.902(2) Å, c = 55.86(1) Å, V = 1684.8(9) Å3, Z = 6. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 2.952 (62) (110), 2.881 (61) (1.0.16), 2.515 (100) (204), 2.493 (88) (1.1.12), 2.451 (39) (1.0.20), 1.690 (19) (304, 2.1.16), 1.572 (19) (2.0.28), 1.475 (29) (221). Zincovelesite-6N6S is the first Fe3+-dominant member of the högbomite supergroup and, thus, can be considered as a parent species of a new mineral group. The rootname velesite is given for the discovery locality near the city of Veles.

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Acknowledgements

This work was financially supported by the Russian Foundation for Basic Research, grant no. 18-05-00051_a. The authors thank the Centre for X-ray Diffraction Studies of SPSU for instrumental support.

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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, Dmitry A. Varlamov & Alexandr D. Chervonnyi

  2. Department of Crystallography, Institute of Earth Sciences, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 St., Petersburg, Russia

    Maria G. Krzhizhanovskaya

  3. Faculty of Technology and Metallurgy, Saints Cyril and Methodius University, Ruger Boskovic 16, 1000, Skopje, Republic of Macedonia

    Simeon Jančev

  4. Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow, 119234, Russia

    Igor V. Pekov

  5. Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432, Russia

    Dmitry A. Varlamov & Vera N. Ermolaeva

  6. Karlsruhe Institute of Technology, Institute for Photon Science and Synchrotron Radiation (IPS), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany

    Jörg Göttlicher

  7. Faculty of Physics, Moscow State University, Vorobievy Gory, 119234, Moscow, Russia

    Vyacheslav S. Rusakov

  8. Department of Mineral Deposits, Institute of Earth Sciences, Faculty of Geology, St. Petersburg State University, Universitetskaya Nab. 7/9, St., Petersburg, 199034, Russia

    Yury S. Polekhovsky

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  1. Nikita V. Chukanov
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  2. Maria G. Krzhizhanovskaya
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  3. Simeon Jančev
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  6. Jörg Göttlicher
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  7. Vyacheslav S. Rusakov
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  8. Yury S. Polekhovsky
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  9. Alexandr D. Chervonnyi
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Correspondence to Nikita V. Chukanov.

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Editorial handling: M. A.T.M. Broekmans

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710_2018_555_MOESM1_ESM.tif

Low-angle fragments of Pawley plot of the XRD pattern of Zincovelesite-6N6S refined in primitive (a) and rhombohedral (b) trigonal cells (TIF 3395 KB)

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Chukanov, N.V., Krzhizhanovskaya, M.G., Jančev, S. et al. Zincovelesite-6N6S, Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH), a new högbomite-supergroup mineral from Jacupica mountains, Republic of Macedonia. Miner Petrol 112, 733–742 (2018). https://doi.org/10.1007/s00710-018-0555-1

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