Structural Behavior of Natural Silicate Carbonate Spurrite Mineral, Ca-5(SiO4)(2)(CO3), under High-Pressure, High-Temperature Conditions

David Santamaria-Perez*, Javier Ruiz-Fuertes, Tomas Marqueno, Julio Pellicer-Porres, Raquel Chulia-Jordan, Simon MacLeod, Catalin Popescu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report on high-pressure and high-temperature angle-dispersive synchrotron X-ray diffraction and high-pressure Raman data up to 27 GPa and 700 K for natural silicate carbonate Ca-5(SiO4)(2)(CO3) spurrite mineral. No phase transition was found in the studied P-T range. The room-temperature bulk modulus of spurrite using Ne as the pressure-transmitting medium is B-0 = 77(1) GPa with a first-pressure derivative of B-0 ' = 5.9(2). The structure compression is highly anisotropic, the b axis being approximately 30% more compressible than the a and c axes. The volumetric thermal expansivity value around 8 GPa was estimated to be 4.1(3) x 10(-5)K(-1). A comparison with intimately related minerals CaCO3 calcite and aragonite and beta-Ca2SiO4 larnite shows that, as the composition and structural features of spurrite suggest, its compressibility and thermal expansivity lie between those of the silicate and carbonate end members. The crystal chemistry and thermodynamic properties of spurrite are discussed.

Original languageEnglish
Pages (from-to)98-105
Number of pages8
JournalInorganic Chemistry
Volume57
Issue number1
Early online date11 Dec 2017
DOIs
Publication statusPublished - 2 Jan 2018

Keywords

  • EQUATION-OF-STATE
  • X-RAY-DIFFRACTION
  • CRYSTAL-STRUCTURE
  • SUBDUCTION ZONES
  • TILLEYITE
  • TRANSITION
  • CACO3
  • CA5(SIO4)2CO3
  • REFINEMENT
  • CHEMISTRY

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