Letter. The elastic properties of diopside, CaMgSi2O6
-
Liqin Sang
,
Carine B. Vanpeteghem
Abstract
The 13 single-crystal elastic moduli of two samples of diopsidic pyroxenes close to the ideal composition (CaMgSi2O6) from different locations have been measured at ambient pressure and room temperature by Brillouin spectroscopy. We obtain (in GPa, ±1σ uncertainty): C11 = 229.0(4), C22 = 179.0(4), C33 = 242.5(4), C44 = 78.9(3), C55 = 68.1(2), C66 = 78.2(3), C12 = 78.0(7), C13 = 69.8(6), C23 = 58.0(7), C15 = 9.9(3), C25 = 6.1(5), C35 = 40.9(3), C46 = 6.6(2), and C11 = 226.1(9), C22 = 179.5(8), C33 = 239.2(9), C44 = 78.1(6), C55 = 69.2(4), C66 = 76.4(8), C12 = 77.4(10), C13 = 70.2(13), C23 = 56.7(16), C15 = 9.9(7), C25 = 5.9(12), C35 = 41.0(7), C46 = 6.8(4) for the two diopside samples. There are no major differences in the elastic tensor of the nearly pure diopside composition compared with the second sample containing slightly higher Al and Fe contents. Polycrystalline averaging of the Cij for the aggregate bulk and shear moduli yield Ks = 114.6(7) GPa, G = 72.7(4) GPa and Ks = 113.7(8) GPa, G = 72.2(5) GPa for the two diopside samples. The shear moduli reported here are 8% larger than those determined from previous measurements on a similar natural sample. We confirm the existence of systematic correlations between the composition of the M2 site and most of the Cij values. No unusual compositional dependence of Cij values or the shear modulus near end-member diopside composition is observed.
© 2015 by Walter de Gruyter Berlin/Boston
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- A mineralogical, geochemical, and microbiogical assessment of the antimony- and arsenic-rich neutral mine drainage tailings near Pezinok, Slovakia
- Luminescence of diamonds from metamorphic rocks
- Crystal chemistry of Th in fluorapatite
- Hydrogen-bond and cation partitioning in muscovite: A single-crystal neutron-diffraction study at 295 and 20 K
- Spectroscopic characterization of transition metal impurities in natural montebrasite/amblygonite
- An assessment of the potential benefits of ion implants as trace-element reference material for electron probe X-ray microanalysis: The case of invisible gold
- The incorporation of hydroxyl into zircon
- Association between phosphorus and iron oxides in manganese ores
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- Monoclinic tridymite in clast-rich impact melt rock from the Chesapeake Bay impact structure
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- Fe-Ti oxide-silicate (QUIlF-type) equilibria in feldspathoid-bearing systems
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- Letter. The elastic properties of diopside, CaMgSi2O6
