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

  • Nikita V. Chukanov
  • Maria G. Krzhizhanovskaya
  • Simeon Jančev
  • Igor V. Pekov
  • Dmitry A. Varlamov
  • Jörg Göttlicher
  • Vyacheslav S. Rusakov
  • Yury S. Polekhovsky
  • Alexandr D. Chervonnyi
  • Vera N. Ermolaeva
Original Paper
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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.

Keywords

New mineral Zincovelesite-6N6S Högbomite supergroup Mössbauer spectroscopy XANES spectroscopy IR spectroscopy Reflectance spectrum Nežilovo Jacupica Mountains Republic of Macedonia 

Notes

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.

Supplementary material

710_2018_555_MOESM1_ESM.tif (3.3 mb)
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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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Nikita V. Chukanov
    • 1
  • Maria G. Krzhizhanovskaya
    • 2
  • Simeon Jančev
    • 3
  • Igor V. Pekov
    • 4
  • Dmitry A. Varlamov
    • 1
    • 5
  • Jörg Göttlicher
    • 6
  • Vyacheslav S. Rusakov
    • 7
  • Yury S. Polekhovsky
    • 8
  • Alexandr D. Chervonnyi
    • 1
  • Vera N. Ermolaeva
    • 5
  1. 1.Institute of Problems of Chemical Physics, Russian Academy of SciencesChernogolovkaRussia
  2. 2.Department of CrystallographyInstitute of Earth Sciences, Saint Petersburg State UniversityPetersburgRussia
  3. 3.Faculty of Technology and MetallurgySaints Cyril and Methodius UniversitySkopjeRepublic of Macedonia
  4. 4.Faculty of GeologyMoscow State UniversityMoscowRussia
  5. 5.Institute of Experimental Mineralogy, Russian Academy of SciencesChernogolovkaRussia
  6. 6.Karlsruhe Institute of Technology, Institute for Photon Science and Synchrotron Radiation (IPS)Eggenstein-LeopoldshafenGermany
  7. 7.Faculty of PhysicsMoscow State UniversityMoscowRussia
  8. 8.Department of Mineral DepositsInstitute of Earth Sciences, Faculty of Geology, St. Petersburg State UniversityPetersburgRussia

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