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Lakargiite CaZrO3: A new mineral of the perovskite group from the North Caucasus, Kabardino-Balkaria, Russia
-
Evgeny V. Galuskin
,
Viktor M. Gazeev
Veröffentlicht/Copyright:
1. April 2015
Abstract
Lakargiite CaZrO3-the zirconium analog of perovskite [Pbnm, a = 5.556(1), b = 5.715(1), c = 7.960(1) Å, V 252.7(1) Å3, Z = 4]-was discovered as an accessory mineral in high-temperature skarns in carbonate-silicate rocks occurring as xenoliths in ignimbrites of the Upper-Chegem (Verkhniy Chegem) volcanic structure, the North Caucasus, Kabardino-Balkaria, Russia. Lakargiite forms pseudo-cubic crystals up to 30-35 μm in size and aggregates up to 200 μm. Lakargiite is associated with spurrite, larnite, calcio-olivine, calcite, cuspidine, rondorfite, reinhardbraunsite, wadalite, perovskite, and minerals of the ellestadite group. The new perovskite mineral belongs to the ternary solid solution CaZrO3-CaTiO3-CaSnO3 with a maximum CaZrO3 content of ca. 93%, maximum CaTiO3 content of 22%, and maximum CaSnO3 content of 20%. Significant impurities are Sc, Cr, Fe, Ce, La, Hf, Nb, U, and Th. Raman spectra of lakargiite are similar to those of the synthetic phase Ca(Zr,Ti)O3 with strong bands at 352, 437, 446, 554, and 748 cm-1. Lakargiite crystallized under sanidinite-facies conditions of contact metamorphism characterized by very high temperatures and low pressures.
Keywords : Lakargiite; perovskite group; solid solution; CaZrO3; CaSnO3; Raman spectroscopy; skarn; Caucasus
Received: 2007-12-19
Accepted: 2008-5-28
Published Online: 2015-4-1
Published in Print: 2008-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Lakargiite;
perovskite group;
solid solution;
CaZrO3;
CaSnO3;
Raman spectroscopy;
skarn;
Caucasus
Artikel in diesem Heft
- Review Paper. Mineral evolution
- Amorphous materials: Properties, structure, and durability: Structure of Mg- and Mg/Ca aluminosilicate glasses: 27Al NMR and Raman spectroscopy investigations
- Amorphous materials: Properties, structure, and durability: Constrained interactions, rigidity, adaptative networks, and their role for the description of silicates
- Amorphous materials: Properties, structure, and durability: Quantification of the kinetics of iron oxidation in silicate melts using Raman spectroscopy and assessment of the role of oxygen diffusion
- Amorphous materials: Properties, structure, and durability: Solubility and solution mechanisms of NOH volatiles in silicate melts at high pressure and temperature—amine groups and hydrogen fugacity
- High- and ultrahigh-pressure metamorphism: Past results and future prospects
- Crystal structure of a synthetic tin-selenium representative of the cylindrite structure type
- Nano to macroscale biomineral architecture of red coral (Corallium rubrum)
- Timescales of spherulite crystallization in obsidian inferred from water concentration profiles
- Compression of single-crystal magnesium oxide to 118 GPa and a ruby pressure gauge for helium pressure media
- In situ high-pressure single-crystal X-ray study of aegirine, NaFe3+Si2O6, and the role of M1 size in clinopyroxene compressibility
- Oxygen fugacity, temperature reproducibility, and H2O contents of nominally anhydrous piston-cylinder experiments using graphite capsules
- Coesite inclusions in garnet from eclogitic rocks in western Tianshan, northwest China: Convincing proof of UHP metamorphism
- Crystal chemistry of macfallite: Relationships to sursassite and pumpellyite
- Bacterially enhanced dissolution of meta-autunite
- Common gem opal: An investigation of micro- to nano-structure
- Structural transition of post-spinel phases CaMn2O4, CaFe2O4, and CaTi2O4 under high pressures up to 80 GPa
- Pressure-temperature stability studies of FeOOH using X-ray diffraction
- The parental melt of lherzolitic shergottite ALH 77005: A study of rehomogenized melt inclusions
- Ferric iron content in (Mg,Fe)SiO3 perovskite and post-perovskite at deep lower mantle conditions
- Lakargiite CaZrO3: A new mineral of the perovskite group from the North Caucasus, Kabardino-Balkaria, Russia
- Xocolatlite, Ca2Mn4+2 Te2O12·H2O, a new tellurate related to kuranakhite: Description and measurement of Te oxidation state by XANES spectroscopy
- Pyroxmangite: A high-pressure single-crystal study
- Letter. Continuous time-resolved X-ray diffraction of the biocatalyzed reduction of Mn oxide
- Letter. Igneous Ca-rich pyroxene in comet 81P/Wild 2
- Letter. A unique glimpse into asteroidal melting processes in the early solar system from the Graves Nunatak 06128/06129 achondrites
