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Structure of walstromite, BaCa2Si3O9, and its relationship to CaSiO3-walstromite and wollastonite-II
-
Madison C. Barkley
,
Robert T. Downs
Veröffentlicht/Copyright:
2. April 2015
Abstract
The crystal structure of walstromite, ideally BaCa2Si3O9, was refined with data from single-crystal X-ray diffraction on a natural specimen from the type locality Esquire No. 8 claim, Big Creek, Fresno County, California, U.S.A. It is triclinic, with space group P1̄ and unit-cell parameters a = 6.7335(2), b = 9.6142(3), c = 6.6859(2) Å, α = 69.638(2)°, β = 102.281(2)°, γ = 96.855(2)°, and V = 396.01(2) Å3. The only previously published structure for walstromite was based on photographic film intensity data collected from synthetic BaCa2Si3O9 (Dent Glasser and Glasser 1968). Due to uncertainty in oxygen positions, the reported final R-factor was 0.16. The current refinement yielded an R-factor of 0.030 with the inclusion of anisotropic displacement parameters.
Walstromite is a Ba-Ca cyclosilicate characterized by Si3O9 three-membered rings. It is related to the important calcium silicate group of minerals, especially to CaSiO3-walstromite, through the substitution of Ba into one of the three distinct Ca sites. Joswig et al. (2003) suggested that the structural changes caused by the replacement of Ba2+ by Ca2+ are minimal and that walstromite is isomorphic with CaSiO3-walstromite, but topologically different from high-pressure wollastonite-II (Ca3Si3O9). Our study demonstrates that wollastonite-II and CaSiO3-walstromite are identical phases, and are isostructural with walstromite. This isomorphism implies that the high-pressure CaSiO3 phase may be a potential host for large cations in deep Earth environments.
Keywords: Walstromite; CaSiO3-walstromite; wollastonite-II; crystal structure; single-crystal X-ray diffraction
Received: 2010-9-25
Accepted: 2011-1-22
Published Online: 2015-4-2
Published in Print: 2011-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Walstromite;
CaSiO3-walstromite;
wollastonite-II;
crystal structure;
single-crystal X-ray diffraction
Artikel in diesem Heft
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- Visualizing trace element distribution in quartz using cathodoluminescence, electron microprobe, and laser ablation-inductively coupled plasma-mass spectrometry
- Krotite, CaAl2O4, a new refractory mineral from the NWA 1934 meteorite
- Translation interface modulation in NC-pyrrhotites: Direct imaging by TEM and a model toward understanding partially disordered structural states
- Crystal chemistry of Ti-rich fluorophlogopite from Presidente Olegario, Alto Paranaíba igneous province, Brazil
- First-principles study of diffusion and viscosity of anorthite (CaAl2Si2O8) liquid at high pressure
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