Elbrusite-(Zr)--A new uranian garnet from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia

Galuskina, Irina O.; Galuskin, Evgeny V.; Armbruster, T.; Lazić, Biljana; Kusz, Joachim; Dzierżanowski, Piotr; Газеев, В.М.; Pertsev, N. N.; Prusik, Krystian; Zadov, Aleksandr E.; Winiarski, A.; Wrzalik, R.; Гурбанов, А. Г.

doi:10.2138/am.2010.3507

Cited by 49 publications

(40 citation statements)

References 27 publications

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“…Garnet, a relatively new host for accommodation of actinides, was proposed in a number of recent studies (Burakov et al, 2000;Burakov and Strykanova, 1998;Galuskina et al, 2010;Guo et al, 2015a;Laverov et al, 2010;Laverov et al, 2003;Livshits, 2008;Rak et al, 2013b;Rusakov et al, 2005;Stefanovsky et al, 2010;Utsunomiya et al, 2002a;Utsunomiya et al, 2002b;Utsunomiya et al, 2005;Yudintsev et al, 2002;Yudintsev et al, 2007;Zamoryanskaya and Burakov, 2000;Zhang et al, 2010) due to its large loading of actinides and good chemical 4 flexibility. The garnet structure has been shown to incorporate actinides in various oxidation states (Burakov et al, 2000;Burakov and Strykanova, 1998;Galuskina et al, 2010;Guo et al, 2014a;Laverov et al, 2010;Rak et al, 2013b;Rusakov et al, 2005;Stefanovsky et al, 2010;Yudintsev et al, 2002;Zamoryanskaya and Burakov, 2000). Notably, significant amounts of U were found in natural uranium bearing garnets, kimzeite (Galuskina et al, 2008) (~ 22 wt.% U) and elbrusite-(Zr) (Galuskina et al, 2010) (~ 27 wt.…”

Section: Introductionmentioning

confidence: 99%

Structure and thermodynamics of uranium-containing iron garnets

Guo

Navrotsky

Kukkadapu

et al. 2016

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 99%

Structure and thermodynamics of uranium-containing iron garnets

Guo

Navrotsky

Kukkadapu

et al. 2016

Geochimica et Cosmochimica Acta

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“…Texture measurements was performed by electron backscattering diffraction (EBSD) which is excellent technique to analyze grains orientation in metals and alloys and widely used in structural analysis of minerals [10]. The distribution of the orientations in the matrix pole figures shows that all specimens are strongly textured polycrystalline materials (Fig.…”

Section: Resultsmentioning

confidence: 99%

Structure of the Extruded and Thermally Treated Ni_54.3Fe_16.2Ga_29.5Alloy

et al. 2016

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Hot extrusion process was applied to Ni54.3Fe16.2Ga29.5 polycrystalline alloy. Then the rod was annealed subsequently for 1 h at 700, 800, 900, and 1100• C. In this paper the effect of annealing on the microstructure of the polycrystalline extruded Ni-Fe-Ga alloy were analyzed. The structure of the alloys was determined by the X-ray and transmission electron microscopy. The electron backscattering diffraction technique was applied to obtain the texture of the extruded rods after heat treatment.

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“…The xenolith containing the two new minerals crops out on the slope of the small ridge joining Lakargi and Vorlan peaks at 3240 m above the sea level and 7 km from the Balkarian village Eltyubyu. Other Ca humite group minerals from the Upper Chegem caldera include kumtyubeite Ca 5 (SiO 4 ) 2 F 2 ), chegemite Ca 7 (SiO 4 ) 3 (OH) 2 ), fluorchegemite Ca 7 (SiO 4 ) 3 F 2 , and reinhardbraunsite Ca 5 (SiO 4 ) 2 (OH) 2 , the type locality of which is * E-mail: evgeny.galuskin@us.edu.pl the Eifel district, Germany (Kirfel et al 1983 (Galuskina et al 2010a(Galuskina et al , 2010b(Galuskina et al , 2010cGrew et al 2012); perovskite group minerals: lakargiite CaZrO 3 , megawite CaSnO 3 (Galuskin et al 2008; calcio-olivine γ-Ca 2 SiO 4 .…”

Section: Introductionmentioning

confidence: 99%

Edgrewite Ca9(SiO4)4F2-hydroxyledgrewite Ca9(SiO4)4(OH)2, a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia

Galuskin

Lazić

Armbruster

et al. 2012

American Mineralogist

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Members of the edgrewite Ca 9 (SiO 4 ) 4 F 2 -hydroxyledgrewite Ca 9 (SiO 4 ) 4 (OH) 2 series, structural analogues of clinohumite-hydroxylclinohumite series, Mg 9 (SiO 4 ) 4 (F,OH) 2 , were discovered in xenoliths of carbonate-silicate rock altered to skarn within ignimbrites of the Upper Chegem volcanic structure, Kabardino-Balkaria, Northern Caucasus, Russia. The new minerals occur sparingly in zones containing bultfonteinite, hillebrandite, jennite, and chegemite, as well as rare relics of larnite and rondorfite enclosed in a matrix of hydroxylellestadite. Edgrewite and hydroxyledgrewite are largely altered to jennite in places with admixed zeophyllite and trabzonite, and are preserved as elongate relics mostly 0.1-0.4 mm long in the central part of atoll-like pseudomorphs. The new minerals form a solid-solution series Ca 9 (SiO 4 ) 4 (F,OH) 2 , in which the content of the edgrewite end-member Ca 9 (SiO 4 ) 4 F 2 ranges from 74% (F = 3.64 wt%) to 31% (F = 1.52 wt%).Structure refinement of crystals containing 51% and 37% of the edgrewite end-member gave, respectively, R 1 = 3.03%, space group P2 1 /b11 (no. 14), Z = 2, a = 5.06870(10), b = 11.35790(10), c = 15.4004(2) Å, α = 100.5980(10)°, V = 871.47(3) Å 3 ; and R 1 = 1.61%, space group P2 1 /b11 (no. 14), Z = 2, a = 5.06720(10), b = 11.35450(10), c = 15.3941(2) Å, α = 100.5870(10)°, and V = 870.63(2) Å 3 .Minerals of the edgrewite-hydroxyledgrewite series are colorless, optically biaxial (+), 2V meas = 80(5)°; 2V calc = 78.7°; dispersion r > v, medium; orientation: Z = a, X ∧ c = 12(2)°; edgrewite: α = 1.621(2), β = 1.625(2), γ = 1.631(2); hydroxyledgrewite: α = 1.625(2), β = 1.629(2), γ = 1.635(2) (589 nm). The micro-hardness VHN 50 = 352-366 kg/mm 2 corresponds to the Mohs scale of 5.5-6. 5. FTIR spectra of edgrewite and hydroxyledgrewite show resolved bands at (edgrewite/hydroxyledgrewite, cm -1 ): 3558 and 3551 and 3543/3554, absent/3486, 1075/1075, 996/996, 980/982, 934/933, 917/918, 904/903, 890/884, 864/864, 842/842, 818/820. Raman spectra are characterized by the following bands (edgrewite/hydroxyledgrewite, cm -1 ) at: 921/923, 889/890, 839/840, and 815/814 (SiO 4 stretching), at: 556/559, 527/527, 423/419, 406/404, and 394/394 (SiO 4 bending), 309/295, 269/256, and 163/166 (CaO 6 ). In the OH stretching region three bands are noted at 3554, 3547, and 3540 cm -1 for edgrewite and two -3550 and 3475 cm -1 for hydroxyledgrewite confirming the corresponding IR spectra. The major difference in Raman and IR spectra of edgrewite and hydroxyledgrewite is the presence of two resolved peaks in the OH stretching region at ca. 3550 and 3480 cm -1 for hydroxyledgrewite.

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Elbrusite-(Zr)--A new uranian garnet from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia

Cited by 49 publications

References 27 publications

Structure and thermodynamics of uranium-containing iron garnets

Structure and thermodynamics of uranium-containing iron garnets

Structure of the Extruded and Thermally Treated Ni_54.3Fe_16.2Ga_29.5Alloy

Edgrewite Ca9(SiO4)4F2-hydroxyledgrewite Ca9(SiO4)4(OH)2, a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia

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Elbrusite-(Zr)--A new uranian garnet from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia

Cited by 49 publications

References 27 publications

Structure and thermodynamics of uranium-containing iron garnets

Structure and thermodynamics of uranium-containing iron garnets

Structure of the Extruded and Thermally Treated Ni54.3Fe16.2Ga29.5Alloy

Edgrewite Ca9(SiO4)4F2-hydroxyledgrewite Ca9(SiO4)4(OH)2, a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia

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Structure of the Extruded and Thermally Treated Ni_54.3Fe_16.2Ga_29.5Alloy