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wollastonite structure

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Journal Article
Published: 01 December 1971
American Mineralogist (1971) 56 (11-12): 2040-2052.
... of a wollastonite structure and a bustamite structure. These structures coexist with hedenbergite as a function of bulk composition and temperature. Crystal chemical considerations require that both pyroxenoid structural variants undergo a series of ordered and disordered state as a function of composition...
Journal Article
Journal: GSA Bulletin
Published: 01 May 1988
GSA Bulletin (1988) 100 (5): 714-732.
... a molar ratio of tilleyite to wollastonite in C|T|W|Q structures of 1T:24W and requires consumption of calcite and quartz in the ratio 29C:26Q. Truncation of fully coarsened impingement wollastonite by columnar tilleyite implies that the tilleyite layer grew at expense of wollastonite...
Journal Article
Published: 01 May 2011
American Mineralogist (2011) 96 (5-6): 797-801.
... apparent differences between the CaSiO 3 -walstromite and wollastonite-II structures, leading them to propose the existence of a new kind of isomorphism where the Si 3 O 9 ring unit is replaced by the same ring, but with the non-bridging apices of the tetrahedra pointing in opposite directions...
FIGURES
Journal Article
Published: 01 October 2001
The Canadian Mineralogist (2001) 39 (5): 1405-1434.
...) and Neojurassic calcitic marbles. Typical wollastonite – grossular – diopside endoskarns are separated from exoskarns (tilleyite and spurrite or wollastonite at CH, wollastonite only at UCV), at most places, by a melilite-rich rock, in which veins and vein-like zones of recrystallization are composed only...
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Journal Article
Published: 01 June 1971
American Mineralogist (1971) 56 (5-6): 877-887.
... in the spectra with structural changes. The optical spectra are due to ferrous iron and appear insensitive to structural detail. The infrared spectra, particularly the Si-0 stretching vibrations, vary markedly with small structural changes. Each structure type, diopside, wollastonite, bustamite and rhodonite has...
Journal Article
Published: 01 November 2016
American Mineralogist (2016) 101 (11): 2544-2553.
... for the existence of this crystal structure based on a hydrogen bond between Pb and O is presented. * E-mail: rmthomps@email.arizona.edu 13 1 2016 27 6 2016 © 2016 Mineralogical Society of America 2016 Clinopyroxene pyroxenoid chain silicate yangite wollastonite diopside close...
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Journal Article
Published: 01 November 2016
American Mineralogist (2016) 101 (11): 2539-2543.
...(4), β = 118.229(4), γ = 109.935(5)°, and V = 392.69(7) Å 3 . Its crystal structure is based on a skeleton of double wollastonite SiO 4 tetrahedral chains oriented parallel to [010] and interlinked with ribbons of Mn- and Pb-polyhedra. Yangite represents the first chain silicate with two-connected...
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Journal Article
Published: 01 April 1978
American Mineralogist (1978) 63 (3-4): 274-288.
...Y. Ohashi; L. W. Finger Abstract Crystal structures and cation occupancies have been refined using single-crystal X-ray diffraction data for natural specimens of (1) manganoan, intermediate, and calcian bus-tamites; (2) ferroan and manganoan wollastonites; and (3) serandite and manganoan pecto...
Journal Article
Published: 01 June 1963
American Mineralogist (1963) 48 (5-6): 588-596.
...Donald R. Peacor; C. T. Prewitt Abstract The structures of bustamite and wollastonite differ principally only in the relative arrangement of chains of tetrahedra. Both structures have a pseudomonoclinic cell, this unit having space group P 2 1 / m in wollastonite and A 2/ m in bustamite. 13 12...
Journal Article
Published: 01 February 2006
American Mineralogist (2006) 91 (2-3): 430-434.
... height and the depletion in the concentration of surface Ca suggest that the laboratory experiment caused both a compositional and structural change on the surface of the wollastonite. As noted above, previous researchers have found indirect evidence for the formation of a leached layer on the surface...
FIGURES
Journal Article
Journal: GSA Bulletin
Published: 01 January 2004
GSA Bulletin (2004) 116 (1-2): 76-93.
... of wollastonite metasandstone contain quartz veins. The areas exposed measure 1–5 m 2 and are pervaded by veins, which form a three-dimensional network with a “mesh” structure. Vein growth was synmetamorphic as indicated by two observations: (1) vein quartz and wollastonite are intimately intergrown...
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Journal Article
Published: 01 December 1978
American Mineralogist (1978) 63 (11-12): 1260-1263.
..., developed a disordered structure. The suggestion by Wenk (1969) that disordering may occur when there is significant resolved shear stress on (010) is confirmed. Syntectonic recrystallization of powder (at a recorded temperature of 1100°C, confining pressure of 10 kbar, and a constant strain rate of 10 −6...
Published: 01 January 2013
DOI: 10.1180/DHZ.20
EISBN: 9780903056434
... Special features Decomposed by concentrated HCl Although it is a single-chain silicate, wollastonite is not a pyroxene. It has a three-tetrahedra repeat structure rather than the two tetrahedra repeat of the pyroxenes, and has been classified as a pyroxenoid. Wollastonite occurs typically...
FIGURES
Journal Article
Published: 01 February 2006
American Mineralogist (2006) 91 (2-3): 446-450.
... (TEM: HITACHI H8000K and JEOL2000FX) at 200 kV. TEM specimens were prepared from petrographic thin sections by further polishing on both sides by Ar ion milling. F igure 6. Projection of the structure of the diopside-type I and the wollastonite ( a ) along the same direction of Figures 1...
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Journal Article
Published: 01 February 2018
Mineralogical Magazine (2018) 82 (1): 95-110.
... geological terms (and associated mineral deposit prospecting criteria) in the way that a major fault or structure close to the deposit is needed as a means of a pathway of conduit to deplete the system of CO 2 (Beisswenger, 1996 ). Other natural (non-economic) occurrences of wollastonite have been...
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Journal Article
Published: 01 November 2009
American Mineralogist (2009) 94 (11-12): 1707-1726.
... structure refinements (compiled in Table 2 ). Initially, refinements for quantitative phase analysis were done using unaltered wollastonite (to estimate the amount of mineral impurities), and using a mixture of unaltered wollastonite and halite (NaCl) as an internal standard. This latter mixture was used...
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Journal Article
Published: 01 May 2012
American Mineralogist (2012) 97 (5-6): 828-839.
... on rutile in time series experiments between one and 107 days at constant P-T conditions of 600 °C and 400 MPa in the system TiO 2 -CaO-SiO 2 -Na 2 O-HCl-H 2 O. A two-capsule assemblage allows for transport of Ca and Si from dissolving wollastonite to dissolving rutile, the Ti-source, in a NaCl-bearing...
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Journal Article
Published: 01 December 2000
Mineralogical Magazine (2000) 64 (6): 1165-1176.
... -rich, internally buffered fluids. Where these are inclose proximity to granitoid pegmatites, wollastonite dominates the matrix, and fractures and veins running through the rock contain concentrations of grossular and vesuvianite. With increasing distance from the pegmatite, vesuvianite...
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Journal Article
Published: 01 August 2000
Mineralogical Magazine (2000) 64 (4): 651-661.
... that of I tc ( Swamy and Dubrovinsky, 1997 ). The r 0 2+ value 0.926 ± 0.002 Å (Table 4 ) is within 2 s.d. error of the crystal structure refinement estimate of r 0 for wollastonite I tc Ca-sites of 1.000 ± 0.065 Å (Table 1 ). T able 2. Concentration of trace elements in the natural...
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Journal Article
Published: 01 January 2015
Bulletin de la Société Géologique de France (2015) 186 (1): 21-34.
... analytiques autres que le microscope. La wollastonite intègre dans sa structure plus de Mn que de Fe puisque le rayon ionique du Mn 2+ est plus proche de celui du Ca 2+ (1,00 Å) que de celui de Fe 2+ (0,78 Å) [ Mason, 1975 ]. La formule chimique calculée de la wollastonite d’Azegour est (Ca 0.97 Mn...
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