Zincovelesite-6N6S, Zn 3(Fe 3+,Mn 3+,Al,Ti) 8O 15(OH), a new högbomite-supergroup mineral from Jacupica mountains, Republic of Macedonia

Nikita V. Chukanov, Maria Krzhizhanovskaya, Simeon Jancev, Igor V. Pekov, Dmitry A. Varlamov, Joerg Goettlicher, Vyacheslav S. Rusakov, Yury S. Polekhovsky, Alexandr D. Chervonnyi, Vera N. Ermolaeva

Research output: Contribution to journalArticlepeer-review

Abstract

A new mineral species zincovelesite-6N6S with the simplified formula Zn 3(Fe 3+,Mn 3+,Al,Ti) 8O 15(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 µm 3 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/mm 2 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/cm 3. In reflected light zincovelesite-6N6S is light grey. The reflectance values [R max/R min, % (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, H 2O determined by gas chromatography of ignition products): MgO 0.97, CuO 0.50, ZnO 30.80, Al 2O 3 8.17, Mn 2O 3 21.31, Fe 2O 3 29.44, TiO 2 5.28, Sb 2O 5 3.74, H 2O 1.1, total 101.31. The empirical formula based on 16 O atoms is H 1.05Zn 3.26Mg 0.21Cu 0.05Fe 3+ 3.18Mn 3+ 2.32Al 1.38Ti 0.57Sb 0.20O 16. Zincovelesite-6N6S is trigonal, probable space group P-3m1, a = 5.902(2) Å, c = 55.86(1) Å, V = 1684.8(9) Å 3, 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 Fe 3+-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.

Original languageEnglish
Pages (from-to)733-742
Number of pages10
JournalMineralogy and Petrology
Volume112
Issue number5
DOIs
StatePublished - 1 Oct 2018

Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Keywords

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

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