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Compressibility trends of the clinopyroxenes, and in-situ high-pressure single-crystal X-ray diffraction study of jadeite

  • Andrew C. McCarthy EMAIL logo , Robert T. Downs and Richard M. Thompson
Published/Copyright: April 1, 2015
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American Mineralogist
From the journal American Mineralogist Volume 93 Issue 1

Abstract

The crystal structure of a natural jadeite, NaAlSi2O6, was studied at room temperature over the pressure range 0-9.17 GPa using single-crystal X-ray diffraction. Unit-cell data were determined at 16 pressures, and intensity data were collected at nine of these pressures. A third-order Birch-Murnaghan equation of state fit to the P-V data yielded V0 = 402.03(2) Å3, K0 = 136.5(14) GPa, and K0' = 3.4(4). Jadeite exhibits strongly anisotropic compression with unit strain axial ratios of 1.00:1.63:2.10. Silicate chains become more O-rotated with pressure, reducing ∠O3-O3-O3 from 174.7(1)° at ambient pressure to 169.2(6)° at 9.17 GPa and bringing the anions of jadeite closer to a cubic closest-packed arrangement. No evidence of a phase transition was observed over the studied pressure range.

In an effort to understand pyroxene compressibilities, selected clinopyroxene bulk moduli were plotted against ambient unit-cell volumes. Two trends were identified and are explained in terms of differences in M2-O3 bonding topologies and the geometric relationship of the bonds with tetrahedral rotation in the silicate chains. Bonds positioned to favor the tetrahedral rotation upon compression are termed “sympathetic,” whereas bonds positioned to resist the rotation are termed “antipathetic.” Examination of the different pyroxene structures indicates that structures containing antipathetic M2- O3 bonds are less compressible than those with only sympathetic M2-O3 bonds. This behavior has not been previously recognized.

Keywords : Jadeite; crystal structure; high pressure; single-crystal X-ray diffraction; pyroxene; clinopyroxene; compressibility; elasticity; bulk modulus
Received: 2006-11-27
Accepted: 2007-9-25
Published Online: 2015-4-1
Published in Print: 2008-1-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2008.2521
Keywords for this article
Jadeite; crystal structure; high pressure; single-crystal X-ray diffraction; pyroxene; clinopyroxene; compressibility; elasticity; bulk modulus

Articles in the same Issue

  1. Footemineite, the Mn-analog of atencioite, from the Foote mine, Kings Mountain, Cleveland County, North Carolina, U.S.A., and its relationship with other roscherite-group minerals
  2. Element mobility and scale of mass transport in the formation of quartz veins during regional metamorphism of the Waits River Formation, east-central Vermont
  3. Chemical and physical transfers in an ultramafic rock weathering profile: Part 1. Supergene dissolution of Pt-bearing chromite
  4. Chemical and physical transfers in an ultramafic rock weathering profile: Part 2. Dissolution vs. accumulation of platinum group minerals
  5. Comparative Raman spectroscopic study on ilmenite-type MgSiO3 (akimotoite), MgGeO3, and MgTiO3 (geikielite) at high temperatures and high pressures
  6. A low-pressure–high-temperature technique for the piston-cylinder
  7. Pressure-induced structural deformation and elastic behavior of wairakite
  8. Metamorphic vanadian-chromian silicate mineralization in carbon-rich amphibole schists from the Malé Karpaty Mountains, Western Carpathians, Slovakia
  9. High-temperature deformation of volcanic materials in the presence of water
  10. Menezesite, the first natural heteropolyniobate, from Cajati, São Paulo, Brazil: Description and crystal structure
  11. Single-crystal X-ray and Raman investigation on melanophlogite from Varano Marchesi (Parma, Italy)
  12. Direnzoite, [NaK6MgCa2(Al13Si47O120)·36H2O], a new zeolite from Massif Central (France): Description and crystal structure
  13. On twinning and microstructures in calcite and dolomite
  14. Density functional calculations of the electronic structure and optical properties of aluminosilicate polymorphs (Al2SiO5)
  15. Crystal-size distribution and composition of garnets in eclogites from the Dabie orogen, central China
  16. Cation order/disorder behavior and crystal chemistry of pyrope-grossular garnets: An 17O 3QMAS and 27Al MAS NMR spectroscopic study
  17. Analytical transmission electron microscopy study of a natural MORB sample assemblage transformed at high pressure and high temperature
  18. Barioperovskite, BaTiO3, a new mineral from the Benitoite Mine, California
  19. The nature of unusual luminescence in natural calcite CaCO3
  20. Carbonate in igneous and metamorphic fluorapatite: Two type A and two type B substitutions
  21. The crystal structure of diopside at pressure to 10 GPa
  22. Electron backscatter diffraction analysis of zircon: A systematic assessment of match unit characteristics and pattern indexing optimization
  23. Compressibility trends of the clinopyroxenes, and in-situ high-pressure single-crystal X-ray diffraction study of jadeite
  24. Synthesis and characterization of low-OH– fluor-chlorapatite: A single-crystal XRD and NMR spectroscopic study
  25. Pressure dependence of the hydrogen-bond geometry in topaz-OD from neutron powder diffraction
  26. Environments around Al, Si, and Ca in aluminate and aluminosilicate melts by X-ray absorption spectroscopy at high temperature
  27. The origin of S4+ detected in silicate glasses by XANES
  28. Effects of ionizing radiation on the hollandite structure-type: Ba0.85Cs0.26Al1.35Fe0.77Ti5.90O16
  29. Letter. Toward a thermal model for the Skaergaard liquidus
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