Journal
MINERALS
Volume 10, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/min10020150
Keywords
uakitite; carlsbergite; osbornite group; troilite; daubreelite; Uakit meteorite; IIAB iron; Buryatia
Funding
- RFBR [17-05-00129]
- State assignment project [IGM SD 0330-2016-0005]
- Initiative Project of Ministry of Science and Higher Education of the Russian Federation
- Act 211 of the Government of the Russian Federation [02.A03.21.0006]
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Uakitite was observed in small troilite-daubreelite (+/-schreibersite) inclusions (up to 100 mu m) and in large troilite-daubreelite nodules (up to 1 cm) in Fe-Ni-metal (kamacite) of the Uakit iron meteorite (IIAB), Republic of Buryatia, Russia. Such associations in the Uakit meteorite seemed to form due to high-temperature (>1000 degrees C) separation of Fe-Cr-rich sulfide liquid from Fe-metal melt. Most inclusions represent alternation of layers of troilite and daubreelite, which may be a result of solid decay of an initial Fe-Cr-sulfide. These inclusions are partially resorbed and mainly located in fissures of the meteorite, which is now filled with magnetite, and rarely other secondary minerals. Phase relations indicate that uakitite is one of the early minerals in these associations. It forms isometric (cubic) crystals (in daubreelite) or rounded grains (in schreibersite). The size of uakitite grains is usually less than 5 mu m. It is associated with sulfides (daubreelite, troilite, grokhovskyite), schreibersite and magnetite. Carlsbergite CrN, a more abundant nitride in the Uakit meteorite, was not found in any assemblages with uakitite. Physical and optical properties of uakitite are quite similar to synthetic VN: yellow and transparent phase with metallic luster; Mohs hardness: 9-10; light gray color with a pinky tint in reflected light; density (calc.) = 6.128 g/cm(3). Uakitite is structurally related to the osbornite group minerals: carlsbergite CrN and osbornite TiN. Structural data were obtained for three uakitite crystals using the electron backscatter diffraction (EBSD) technique. Fitting of the EBSD patterns for a synthetic VN model (cubic, Fm-3m, a = 4.1328(3) angstrom; V = 70.588(9) angstrom(3); Z = 4) resulted in the parameter MAD = 0.14-0.37 degrees (best-good fit). Analytical data for uakitite (n = 54, in wt. %) are: V, 71.33; Cr, 5.58; Fe, 1.56; N, 21.41; Ti, below detection limit (<0.005). The empirical formula (V0.91Cr0.07Fe0.02)(1.00)N-1.00 indicates that chromium incorporates in the structure according to the scheme V3+ -> Cr3+ (up to 7 mol. % of the carlsbergite end-member).
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