Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111811
Title: Ellinaite, CaCr2O4, a New Natural Post-Spinel Oxide from Hatrurim Basin, Israel, and Juína Kimberlite Field, Brazil
Authors: Sharygin, V. V.
Britvin, S. N.
Kaminsky, F. V.
Wirth, R.
Nigmatulina, E. N.
Yakovlev, G. A.
Novoselov, K. A.
Murashko, M. N.
Issue Date: 2021
Publisher: Copernicus GmbH
Copernicus GmbH
Citation: Ellinaite, CaCr2O4, a New Natural Post-Spinel Oxide from Hatrurim Basin, Israel, and Juína Kimberlite Field, Brazil / V. V. Sharygin, S. N. Britvin, F. V. Kaminsky et al. // European Journal of Mineralogy. — 2021. — Vol. 33. — Iss. 6. — P. 727-742.
Abstract: Ellinaite, a natural analog of the post-spinel phase β-CaCr2O4, was discovered at the Hatrurim Basin, Hatrurim pyrometamorphic formation (the Mottled Zone), Israel, and in an inclusion within the super-deep diamond collected at the placer of the Sorriso River, Juína kimberlite field, Brazil. Ellinaite at the Hatrurim Basin is confined to a reduced rankinite-gehlenite paralava, where it occurs as subhedral grains up to 30μm in association with gehlenite, rankinite and pyrrhotite or forms the rims overgrowing zoned chromite-magnesiochromite. The empirical formula of the Hatrurim sample is (Ca0.960Fe0.0162+Na0.012Mg0.003)0.992(Cr1.731V0.1833+Ti0.0683+Al0.023Ti0.0034+)2.008O4. The mineral crystallizes in the orthorhombic system, space group Pnma, unit-cell parameters refined from X-ray single-crystal data: A 8.868(9), b 2.885(3), c 10.355(11)Å, V 264.9(5)Å3 and ZCombining double low line4. The crystal structure of ellinaite from the Hatrurim Basin has been solved and refined to R1Combining double low line0.0588 based on 388 independent observed reflections. Ellinaite in the Juína diamond occurs within the micron-sized polyphase inclusion in association with ferropericlase, magnesioferrite, orthorhombic MgCr2O4, unidentified iron carbide and graphite. Its empirical formula is Ca1.07(Cr1.71Fe0.063+V0.06Ti0.03Al0.03Mg0.02Mn0.02)ς1.93O4. The unit-cell parameters obtained from HRTEM data are as follows: Space group Pnma, a 9.017, b 2.874Å, c 10.170Å, V 263.55Å3, ZCombining double low line4. Ellinaite belongs to a group of natural tunnel-structured oxides of the general formula AB2O4, the so-called post-spinel minerals: Marokite CaMn2O4, xieite FeCr2O4, harmunite CaFe2O4, wernerkrauseite CaFe23+Mn4+O6, chenmingite FeCr2O4, maohokite MgFe2O4 and tschaunerite Fe(FeTi)O4. The mineral from both occurrences seems to be crystallized under highly reduced conditions at high temperatures (>1000°C), but under different pressure: Near-surface (Hatrurim Basin) and lower mantle (Juína diamond). © 2021 Victor V. Sharygin et al.
Keywords: CARBIDES
CHROMIUM COMPOUNDS
CRYSTAL STRUCTURE
DIAMONDS
MINERALS
SINGLE CRYSTALS
VOLCANIC ROCKS
EMPIRICAL FORMULAS
GEHLENITE
MAGNESIOCHROMITE
NATURAL ANALOG
ORTHORHOMBIC SYSTEMS
SPACE GROUPS
SPINEL OXIDE
SPINEL PHASE
SUBHEDRAL GRAINS
UNIT CELL PARAMETERS
IRON COMPOUNDS
CRYSTAL STRUCTURE
CRYSTALLIZATION
ELLINAITE
INCLUSION
KIMBERLITE
NEW MINERAL
BRAZIL
HATRURIM BASIN
ISRAEL
JUINA
MATO GROSSO
SOUTHERN DISTRICT
URI: http://hdl.handle.net/10995/111811
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85120910356
PURE ID: 29074018
ISSN: 0935-1221
metadata.dc.description.sponsorship: Raman spectroscopy and EBSD investigations for the Hatrurim ellinaite were done on state assignment of IGM SB RAS (IX.125.2) and the Initiative Project of Ministry of Science and Higher Education of the Russian Federation (Act 211 of the Government of the Russian Federation (grant agreement no. 02.A03.21.0006)). SEM and microprobe studies for the Hatrurim ellinaite were supported by the Russian Science Foundation (grant no. 17-17-01056p). Crystallographic studies of the Hatrurim ellinaite were provided by the Russian Science Foundation (grant no. 18-17-00079).
RSCF project card: 17-17-01056
18-17-00079
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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