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Leter. Discovery of dmisteinbergite (hexagonal CaAl2Si2O8) in the Allende meteorite: A new member of refractory silicates formed in the solar nebula

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Published/Copyright: March 7, 2015
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American Mineralogist
From the journal American Mineralogist Volume 98 Issue 7

Abstract

Dmisteinbergite, CaAl2Si2O8 with P63/mcm structure, was identified in a rounded coarse-grained igneous Type B2 Ca-,Al-rich inclusion (CAI) STP-1 from the Allende CV3 carbonaceous chondrite. STP-1 belongs to a very rare type of refractory inclusions, Fractionation and Unknown Nuclear effects (FUN) CAIs, which experienced melt evaporation and crystallization at low total gas pressure (P < 10-6 bar) in a high-temperature (>1200 °C) region, possibly near the proto-Sun and were subsequently radially transported away from region, possibly by a disk wind. The Allende dmisteinbergite occurs as irregular single crystals (100-600 mm in size) in contact with gehlenitic melilite and Al,Ti-diopside, poikilitically enclosing euhedral spinel, and rare anorthite. It is colorless and transparent. The mean chemical composition, determined by electron microprobe analysis, is (wt%) SiO2 42.6, Al2O3 36.9, CaO 20.2, MgO 0.05, sum 99.75, giving rise to an empirical formula of Ca1.01Al1.96Si2.02O8. Its electron backscatter diffraction patterns are a good match to that of synthetic CaAl2Si2O8 with the P63/mcm structure and the unit cell a = 5.10 Å, c = 14.72 Å, and Z = 2. Dmisteinbergite could have crystallized from a silicate melt at high temperature (~1200-1400 °C) via rapid cooling. Dmisteinbergite in Allende, the first find in a meteorite, is a new member of refractory silicates, among the first solid materials formed in the solar nebula

Keywords: Dmisteinbergite; hexagonal CaAl2Si2O8; new refractory silicate; Allende meteorite; carbonaceous chondrite; Ca-,Al-rich refractory inclusion; solar nebula; EBSD
Received: 2013-2-5
Accepted: 2013-4-3
Published Online: 2015-3-7
Published in Print: 2013-7-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2013.4496
Keywords for this article
Dmisteinbergite; hexagonal CaAl2Si2O8; new refractory silicate; Allende meteorite; carbonaceous chondrite; Ca-,Al-rich refractory inclusion; solar nebula; EBSD

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  1. Highlights and Breakthroughs. A step closer to predicting the bonding geometry of crystals
  2. Minerals in the Human. Body Crystal chemistry of cement-asbestos
  3. Versatile monazite: Resolving geological records and solving challenges in materials science. Microprobe analysis and dating of monazite from the Potsdam Formation, New York: A progressive record of chemical reaction and fluid interaction
  4. A study of ruby (corundum) compositions from the Mogok Belt, Myanmar: Searching for chemical fingerprints
  5. The dehydroxylation of chrysotile: A combined in situ micro-Raman and micro-FTIR study
  6. Synchrotron Mössbauer study of Fe-bearing pyrope at high pressures and temperatures
  7. In situ Raman spectroscopic study of transient polyhedral distortions during cesium ion exchange into sitinakite
  8. A micro-reflectance IR spectroscopy method for analyzing volatile species in basaltic, andesitic, phonolitic, and rhyolitic glasses
  9. Fundamental Mössbauer parameters of synthetic Ca-Mg-Fe pyroxenes
  10. Iron oxidation state in phyllosilicate single crystals using Fe-K pre-edge and XANES spectroscopy: Effects of the linear polarization of the synchrotron X-ray beam
  11. Effect of particle size on phase transitions in metastable alumina nanoparticles: A view from high-resolution solid-state 27Al NMR study
  12. Magnesite formation from MgO and CO2 at the pressures and temperatures of Earth’s mantle
  13. Investigation of the hydrozincite structure by infrared and solid-state NMR spectroscopy
  14. Local structure in C2/c clinopyroxenes on the hedenbergite (CaFeSi2O6)-ferrosilite (Fe2Si2O6) join: A new interpretation for the Mössbauer spectra of Ca-rich C2/c clinopyroxenes and implications for pyroxene exsolution
  15. On the effect of carbonate on barite growth at elevated temperatures
  16. The structure of (Ca,Co)CoSi2O6 pyroxenes and the Ca-M2+ substitution in (Ca,M2+)M2+Si2O6 pyroxenes (M2+ = Co, Fe, Mg)
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  18. In situ dehydration behavior of veszelyite (Cu,Zn)2Zn(PO4)(OH)3-2H2O: A single-crystal X-ray study
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