Nataliakulikite, Ca4Ti2(Fe3+,fe2+)(Si,fe3+,al)o11, a new perovskite-supergroup mineral from hatrurim basin, negev desert, Israel

Victor V. Sharygin, Grigory A. Yakovlev, Richard Wirth, Yurii V. Seryotkin, Ellina V. Sokol, Elena N. Nigmatulina, Nikolai S. Karmanov, Leonid A. Pautov

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2 Citations (Scopus)

Abstract

Nataliakulikite, Ca4Ti2(Fe3+,Fe2+)(Si,Fe3+,Al)O11, is a mineral intermediate between perovskite CaTiO3 and brownmillerite Ca2(Fe,Al)2O5. It was discovered as a minor mineral in a high-temperature pyrometamorphic larnite-gehlenite rock at the Nahal Morag Canyon of the Hatrurim Basin, Israel. Nataliakulikite is associated with larnite, flamite, gehlenite, magnesioferrite, Fe3+-rich perovskite, fluorapatite, barite, Hashemite, and retrograde phases (afwillite, hillebrandite, portlandite, calcite, ettringite, hydrogarnet, and other hydrated Ca-silicates). The mineral forms brown subhedral or prismatic grains (up to 20 µm) and their intergrowths (up to 50 µm). Its empirical formula (n = 47) is (Ca3.992Sr0.014U0.004)(Ti1.933Zr0.030Nb0.002) (Fe3+0.610Fe2+0.405Cr0.005Mn0.005)(Si0.447Fe3+0.337Al0.216)O11 and shows Si predominance in tetrahedral site. The unit-cell parameters (HRTEM data) and space group are: a = 5.254, b = 30.302, c = 5.488 Å, V = 873.7 Å3, Pnma, Z = 4. These dimensions and Electron backscatter diffraction (EBSD) data strongly support the structural identity between nataliakulikite and synthetic Ca4Ti2Fe3+2O11 (2CaTiO3·Ca2Fe3+2O5), an intermediate compound in the system CaTiO3-Ca2Fe3+2O5. In general, this mineral is a Si-Fe2+-rich natural analog of synthetic Ca4Ti2Fe3+2O11. The X-ray powder diffraction data (CuKα-radiation), calculated from unit-cell dimensions, show the strongest lines {d [Å], (Icalc)} at: 2.681(100), 1.898(30), 2.627(26), 2.744(23), 1.894(22), 15.151(19), 1.572(14), 3.795(8). The calculated density is 4.006 g/cm3. The crystal structure of nataliakulikite has not been refined because of small sizes of grains. The Raman spectrum shows strong bands at 128, 223, 274, 562, and 790 cm−1. Nataliakulikite from the Hatrurim Basin crystallized under the conditions of combustion metamorphism at high temperatures (1160–1200C) and low pressures (HT-region of the spurrite-merwinite facies).

Original languageEnglish
Article number700
Number of pages26
JournalMinerals
Volume9
Issue number11
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • Combustion metamorphism
  • Hatrurim Basin
  • Israel
  • Larnite-gehlenite rock
  • Nataliakulikite
  • Perovskite supergroup
  • Perovskite-brownmillerite series
  • Pyrometamorphism
  • combustion metamorphism
  • pyrometamorphism
  • ION-BEAM FIB
  • METAMORPHIC COMPLEX
  • CRYSTAL-STRUCTURE
  • HIGH-TEMPERATURES
  • BROWNMILLERITE SERIES
  • X-RAY-DIFFRACTION
  • ELECTRON-MICROSCOPY
  • PALESTINIAN AUTONOMY
  • PYROMETAMORPHIC ROCKS
  • MODULAR STRUCTURE
  • larnite-gehlenite rock
  • perovskite-brownmillerite series
  • nataliakulikite
  • perovskite supergroup

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