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Elbrusite-(Zr)—A new uranian garnet from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia
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Irina O. Galuskina
,
Evgeny V. Galuskin
Published/Copyright:
April 2, 2015
Abstract
Elbrusite-(Zr) Ca3(U6+Zr)(Fe3+2 Fe2+)O12, a new uranian garnet (Ia3̅d, a ≈ 12.55 Å, V ≈ 1977 Å3, Z = 8), within the complex solid solution elbrusite-kimzeyite-toturite Ca3(U,Zr,Sn,Ti,Sb,Sc,Nb...)2(Fe,Al,Si,Ti)3O12 was discovered in spurrite zones in skarn xenoliths of the Upper Chegem caldera. The empirical formula of holotype elbrusite-(Zr) with 25.14 wt% UO3 is (Ca3.040Th0.018Y0.001)Σ3.059(U6+0.658Zr1.040Sn0.230Hf0.009Mg0.004)Σ1.941(Fe3+1.575Fe2+0.559Al0.539Ti40.199Si0.099Sn0.025V5+0.004)Σ3O12. Associated minerals are spurrite, rondorfite, wadalite, kimzeyite, perovskite, lakargiite, ellestadite-(OH), hillebrandite, afwillite, hydrocalumite, ettringite group minerals, and hydrogrossular. Elbrusite-(Zr) forms grains up to 10-15 μm in size with dominant {110} and minor {211} forms. It often occurs as zones and spots within Fe3+-dominant kimzeyite crystals up to 20-30 μm in size. The mineral is dark-brown to black with a brown streak. The density calculated on the basis of the empirical formula is 4.801 g/cm3 The following broad bands are observed in the Raman spectra of elbrusite-(Zr): 730, 478, 273, 222, and 135 cm-1. Elbrusite-(Zr) is radioactive and nearly completely metamict. The calculated cumulative dose (α-decay events/mg) of the studied garnets varies from 2.50 × 1014 [is equivalent to 0.04 displacement per atom (dpa)] for uranian kimzeyite (3.36 wt% UO3), up to 2.05 × 1015 (0.40 dpa) for elbrusite-(Zr) with 27.09 wt% UO3.
Keywords: Elbrusite-(Zr); new garnet; uranium; solid solution; metamictization; Raman spectroscopy; EBSD; Upper Chegem caldera
Received: 2010-1-20
Accepted: 2010-4-1
Published Online: 2015-4-2
Published in Print: 2010-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Elbrusite-(Zr);
new garnet;
uranium;
solid solution;
metamictization;
Raman spectroscopy;
EBSD;
Upper Chegem caldera
Articles in the same Issue
- Resonant X-ray emission study of the lower-mantle ferropericlase at high pressures
- Uranyl phosphate sheet reconstruction during dehydration of metatorbernite [Cu(UO2)2(PO4)2·8H2O]
- Detection of structurally bound hydroxyl in fluorapatite from Apollo Mare basalt 15058,128 using TOF-SIMS
- Quantum-mechanical evaluation of Np-incorporation into studtite
- Electronic structure and local environment of substitutional V3+ in grossular garnet Ca3Al2(SiO4)3: K-edge X-ray absorption spectroscopy and first-principles modeling
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- What drives the distribution in nature of 3T vs. 2M1 polytype in muscovites and phengites? A general assessment based on new data from metamorphic and igneous granitoid rocks
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- Time-resolved in situ studies of apatite formation in aqueous solutions
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- Elastic behavior of zeolite boggsite in silicon oil and aqueous medium: A case of high-pressure-induced over-hydration
- Low-temperature infrared spectroscopic study of OH-stretching modes in kaolinite and dickite
- Stability field of the high-temperature orthorhombic phase in the enstatite-diopside system
- Unique crystal chemistry of two polymorphs of topaz-OH: A multi-nuclear NMR and Raman study
- Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan
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