The effect of the hedenbergitic substitution on the compressibility of jadeite

Fabrizio Nestola, T. Boffa Ballaran, C. Liebske, R. Thompson, Robert T Downs

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Four synthetic crystals belonging to the jadeite (Jd, NaAlSi2O6)-hedenbergite (Hd, CaFeSi2O6) solid solution were investigated by X-ray diffraction in situ at high pressure using a diamond anvil cell to Pmax = 10.6 GPa. The samples exhibited space group symmetry C2/c throughout the investigated pressure range and did not show any phase transformations. V0, KT0, and K' were simultaneously refined by fitting a third-order Birch-Murnaghan equation of state to pressure-volume data for all samples. The following relationship between bulk modulus and molar fraction of jadeite is observed: KT0 = 108.7(2) (GPa) + 0.191(9) × [% molar Jd] + 0.0006(1) × [% molar Jd]2 The bulk modulus of hedenbergite is 19% lower than jadeite with a strong axial anisotropy that increases with increasing the Hd content. In particular, the compressibility along the b axis (the most compressible in pyroxenes) increases by about 35% going from Jd to Hd while along the c axis the increase in compressibility is about 24%. The a axis does not show any variation in the deformation rate along the join. The analysis of the crystal structure behavior with pressure for all samples clearly indicates that the main cause of the strong anisotropy on the b-c plane is related to the narrowing of the M1 octahedral chain and to anion-anion interactions increasing the packing efficiency of the anion skeletons of the crystals going from Jd to Hd.

Original languageEnglish (US)
Pages (from-to)1005-1013
Number of pages9
JournalAmerican Mineralogist
Volume93
Issue number7
DOIs
StatePublished - Jul 2008

Fingerprint

jadeite
compressibility
Compressibility
hedenbergite
anion
substitution
Substitution reactions
bulk modulus
substitutes
anions
Anions
anisotropy
crystal
diamond anvil cell
pyroxenes
Anisotropy
Elastic moduli
anvils
musculoskeletal system
solid solution

Keywords

  • Crystal structure
  • High pressure
  • Solid solution
  • X-ray

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

The effect of the hedenbergitic substitution on the compressibility of jadeite. / Nestola, Fabrizio; Boffa Ballaran, T.; Liebske, C.; Thompson, R.; Downs, Robert T.

In: American Mineralogist, Vol. 93, No. 7, 07.2008, p. 1005-1013.

Research output: Contribution to journalArticle

Nestola, F, Boffa Ballaran, T, Liebske, C, Thompson, R & Downs, RT 2008, 'The effect of the hedenbergitic substitution on the compressibility of jadeite', American Mineralogist, vol. 93, no. 7, pp. 1005-1013. https://doi.org/10.2138/am.2008.2773
Nestola, Fabrizio ; Boffa Ballaran, T. ; Liebske, C. ; Thompson, R. ; Downs, Robert T. / The effect of the hedenbergitic substitution on the compressibility of jadeite. In: American Mineralogist. 2008 ; Vol. 93, No. 7. pp. 1005-1013.
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