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walstromite

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Journal Article
Published: 01 May 2011
American Mineralogist (2011) 96 (5-6): 797–801.
...Madison C. Barkley; Robert T. Downs; Hexiong Yang Abstract The crystal structure of walstromite, ideally BaCa 2 Si 3 O 9 , 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...
FIGURES
Journal Article
Published: 01 August 2009
European Journal of Mineralogy (2009) 21 (4): 705–714.
...Guido Dörsam; Axel Liebscher; Bernd Wunder; Gerhard Franz; Matthias Gottschalk Abstract (Ca,Sr)-walstromite with the mean composition Ca 0.43 Sr 0.57 [SiO 3 ] was synthesized at 4 GPa/600 °C and X Sr bulk = 0.875 in presence of a 1 molar aqueous (Ca,Sr)Cl 2 fluid together with monoclinic (Ca,Sr...
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Journal Article
Published: 15 February 2021
Mineralogical Magazine (2021) 85 (2): 224–232.
... 2 (6-fold coordinated). A (= Ca 3) is occupied by Pb 2+ (or Ba 2+ ) in 6+4 coordination, or 6+1 when occupied by Ca; this third site occurs within the 3R-layer in a peripheral position. Three minerals belong to this group: margarosanite (ideally PbCa 2 Si 3 O 9 ), walstromite (BaCa 2 Si 3 O 9...
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Journal Article
Published: 01 January 2018
American Mineralogist (2018) 103 (1): 69–74.
... within them as inclusions are considered to be the products of retrograde transformation from lower-mantle or transition-zone precursors. CaSiO 3 -walstromite, the most abundant Ca-bearing mineral inclusion found in super-deep diamonds, is believed to derive from CaSiO 3 -perovskite, which is stable only...
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Journal Article
Published: 01 January 2013
European Journal of Mineralogy (2013) 25 (1): 71–77.
...Michael Gaft; H Yeates; Lev Nagli Abstract Visual luminescence of natural margarosanite, swedenborgite and walstromite is well known for mineralogists, but their spectral characteristics and interpretation were still missing. We studied those minerals by laser-induced time-resolved luminescence...
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Journal Article
Published: 01 February 2012
American Mineralogist (2012) 97 (2-3): 262–267.
...Xi Liu; Sicheng Wang; Qiang He; Jinlan Chen; Hejing Wang; Sichen Li; Fang Peng; Lifei Zhang; Yingwei Fei Abstract Walstromite-structured CaSiO 3 (Wal) was synthesized at 6 GPa and 1200 °C for 6 h using a cubic press, and its thermal elastic behavior was investigated at T up to 900 °C using a powder...
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Journal Article
Published: 01 February 1968
American Mineralogist (1968) 53 (1-2): 9–13.
...L. S. Dent Glasser; F. P. Glasser Abstract The crystal structure of walstromite, Ca 2 BaSi 3 O 9 , has been determined by X-ray structure analysis using two-dimensional data. It contains (Si 3 O 9 ) 6- rings; the coordination of the divalent cations is highly irregular. 26 1 1967 3 7...
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Refined lattice parameters for (Ca,Sr)-<b>walstromite</b> from this study based on...
Published: 01 August 2009
Fig. 4. Refined lattice parameters for (Ca,Sr)-walstromite from this study based on powder and single-crystal X-ray diffraction compared to published lattice parameters for Ca-walstromite, Ca-wollastonite-II, and Sr-wollastonite-II ( Trojer 1969 ; Machida et al. , 1982 ; Joswig et al. , 2003
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Structures of Ca-<b>walstromite</b> (left) and Ca-wollastonite-II (right) accordin...
Published: 01 August 2009
Fig. 2. Structures of Ca-walstromite (left) and Ca-wollastonite-II (right) according to Joswig et al. (2003) and Trojer (1969) . Both structures are built up by Si 3 O 9 rings between with three different A-sites form. The arrangement of the principal building units are comparable in both
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Raman spectra of <b>walstromite</b>, swedenborgite and margarosanite.
Published: 01 January 2013
Fig. 2 Raman spectra of walstromite, swedenborgite and margarosanite.
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Chemical variation Ba  vs . Pb in <b>walstromite</b>–margarosanite based on EDS an...
Published: 15 February 2021
Fig. 4. Chemical variation Ba vs . Pb in walstromite–margarosanite based on EDS analyses. The linear regression line ( R 2 = 0.99) verifies the binary solid solution.
Image
SEM-BSE image of the mineral assemblage in sample GEO-NRM #19940358, with w...
Published: 15 February 2021
Fig. 1. SEM-BSE image of the mineral assemblage in sample GEO-NRM #19940358, with walstromite–margarosanite (Wal), celsian (Cls), phlogopite (Phl), andradite (Adr) and nasonite (Nas).
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Raman spectra of synthetic CaSiO 3 -<b>walstromite</b> up to 7.5 GPa. (Color onlin...
Published: 01 January 2018
Figure 2. Raman spectra of synthetic CaSiO 3 -walstromite up to 7.5 GPa. (Color online.)
Journal Article
Published: 01 August 2001
The Canadian Mineralogist (2001) 39 (4): 1059–1064.
... are anandite, benitoite, bigcreekite, fresnoite, kinoshitalite, krauskopfite, macdonaldite, pellyite, titantaramellite, walstromite, witherite, biotite, diopside, fluorapatite, pentlandite, schorl, vesuvianite and three undefined species. Individual grains of fencooperite are anhedral to somewhat rounded...
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Continuous wave luminescence of <b>walstromite</b> under excitation by 437 nm wave...
Published: 01 January 2013
Fig. 7 Continuous wave luminescence of walstromite under excitation by 437 nm wavelength at 300 K.
Journal Article
Published: 01 December 1994
American Mineralogist (1994) 79 (11-12): 1219–1222.
...Tibor Gasparik; Kenneth Wolf; Christopher M. Smith Abstract Phase relations in the CaSiO 3 system were experimentally determined at 8–15.2 GPa and 850–2510 °C with a split-sphere anvil apparatus. Below the solidus, a field of Ca 2 SiO 4 + CaSi 2 O 5 is stable between that of CaSiO 3 walstromite...
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Visual luminescence of margarosanite (upper), <b>walstromite</b> (middle) and swed...
Published: 01 January 2013
Fig. 1 Visual luminescence of margarosanite (upper), walstromite (middle) and swedenborgite (down) under UV lamp excitation.
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Calculated pressure dependencies of the three main Raman vibrational freque...
Published: 01 January 2018
Figure 4. Calculated pressure dependencies of the three main Raman vibrational frequencies of CaSiO 3 -walstromite at different stress states. (Color online.)
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The structure of <b>walstromite</b>. Rings of silicate tetrahedra occupy layers wi...
Published: 01 May 2011
F igure 1. The structure of walstromite. Rings of silicate tetrahedra occupy layers with the apices of alternating rings pointing in opposite directions.
Image
BSE-image of large (Ca,Sr)-<b>walstromite</b> crystals (Wal) coexisting with small...
Published: 01 August 2009
Fig. 3. BSE-image of large (Ca,Sr)-walstromite crystals (Wal) coexisting with small (Ca,Sr)-lawsonite crystals (Law).