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iron disilicates

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Journal Article
Published: 01 December 1943
American Mineralogist (1943) 28 (11-12): 545–562.
... networks that will disintegrate into units of low molecular weight. (a) Disilicates containing appreciable ferric iron in the silicon-oxygen sheets. (b) Minerals of the silica type with three-dimensional networks that contain aluminum in the ratio of at least two aluminum atoms to three silicon atoms...
Journal Article
Published: 01 November 2004
American Mineralogist (2004) 89 (11-12): 1640–1646.
... disilicate glass, and an iron-titanium-bearing basaltic glass) and V content (from 0.1 to 5 V 2 O 5 wt%) on the structural role of V in these glasses. The combined analysis of high-resolution XANES spectra and EXAFS data indicate that on average, the Fe-free glasses synthesized in air show vanadium in the V...
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Journal Article
Published: 01 September 2002
European Journal of Mineralogy (2002) 14 (5): 969–975.
... that FeO (total iron) content in Fe-rich chevkinite(Ce) ranges from 10.97 % to 11.59 % (wt.) and Ce 2 O 3 from 23 % to 25 %. There are deficient A - and ( B + C )-type cations in the formula. The crystal structure of Fe-rich chevkinite-(Ce) was refined from CCD data in the space-group type C 2/ m ( R...
FIGURES
Journal Article
Published: 01 July 2003
European Journal of Mineralogy (2003) 15 (4): 725–731.
... to be isostructural with the synthetic, low-temperature lanthanide disilicates (general formula Ln 2 Si 2 O 7 ) with tetragonal symmetry (space group P 4 1 ). Unit-cell parameters are a = 6.7805(8) and c = 24.689(4) Å (refined from powder data) with Z = 8. The structure has been refined from single crystal data...
FIGURES
Journal Article
Published: 01 October 2005
American Mineralogist (2005) 90 (10): 1597–1605.
..., where the end-members are Na-disilicate and one of the lanthanide sesquioxides (i.e., Ce 2 O 3 , Pr 2 O 3 , Nd 2 O 3 , Sm 2 O 3 , Eu 2 O 3 , Gd 2 O 3 , Tb 2 O 3 , Dy 2 O 3 , Ho 2 O 3 , Er 2 O 3 , Tm 2 O 3 , and Yb 2 O 3 ), have been measured using the double-bob Archimedean method. The present results...
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Journal Article
Published: 01 October 2008
European Journal of Mineralogy (2008) 20 (5): 975–981.
... . The stacking of both units defines the structure of the derbylite type with channels that may be described as chains of empty cube-octahedra running parallel to [011] in triclinic setting. In batisivite adjacent cube-octahedra are alternately occupied by Ba and disilicate units, lowering the symmetry...
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Journal Article
Published: 01 January 2011
Reviews in Mineralogy and Geochemistry (2011) 73 (1): 113–141.
... in the glass batch usually accounts for less than 1 wt% ( Krauβ et al. 1995 ; Scalet 1996 ). Naturally occurring iron sulfide (FeS 2 ) is used as a sulfur source and reducing agent in amber-colored glass production. Moreover, small but not negligible amounts of sulfur can be involuntarily added...
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Journal Article
Published: 16 May 2019
The Canadian Mineralogist (2019) 57 (3): 339–361.
..., eudialyte, astrophyllite–kupletskite, F-disilicates, phosphates, phosphosilicates, and F-REE-carbonates, with their specific ranges of composition. These accessory minerals often mantle zircon and fluorite corroded crystals, evidence of (1) the petrographic transition from miaskitic to agpaitic in the same...
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Journal Article
Published: 01 November 2004
European Journal of Mineralogy (2004) 16 (6): 957–969.
... microprobe chemical data single-crystal X-ray diffractometry crystal structure Rare Zr-Ti-Nb disilicates are typical accessory minerals of nepheline syenites and carbonatites. During petrographic studies, their identification is usually based on electron-microprobe chemical data, as, for example...
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Journal Article
Published: 01 February 2006
American Mineralogist (2006) 91 (2-3): 366–374.
...M. Potuzak; D.B. Dingwell; B. Ledda; P. Courtial Abstract The densities of 8 Zn-bearing silicate melts have been determined, in equilibrium with air, in the temperature range of 1363 to 1850 K. The compositional joins investigated [sodium disilicate (NS2)–ZnO; anorthite–diopside 1 bar eutectic...
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Journal Article
Published: 25 March 2021
The Canadian Mineralogist (2021) 59 (1): 107–124.
... §   Corresponding author e-mail address : rfischer@uni-bremen.de 9 5 2020 17 8 2020 2021 [5] Ti and vanadyl compounds titanium disilicate minerals [5] Ti–O bond distances vanadyl V=O bond distances bond valence sum around oxygen electronic polarizabilities electronic...
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Journal Article
Published: 01 February 2005
Clays and Clay Minerals (2005) 53 (1): 37–44.
... microscopy/energy dispersive X-ray analysis. Lutetium cations react with the silicon framework of both 2:1 layered aluminosilicates under hydrothermal conditions, and new phases, lutetium disilicate, kaolinite, boehmite and natrosilite are generated. The results demonstrate that the efficiency...
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Journal Article
Published: 01 April 2014
American Mineralogist (2014) 99 (4): 696–703.
... the overpack comes into contact with groundwater higher concentrations of CO 3 2− ions ( Ishidera et al. 2008 ), it will begin to corrode and, therefore, smectite could interact with dissolved iron, hydrogen gas and other corrosion products of the steel overpack such as magnetite (Fe 3 O 4 ), goethite [FeO...
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Journal Article
Published: 13 July 2022
Mineralogical Magazine (2022) 86 (5): 777–791.
... specimen is as follows: (Ba 1.32 Ca 0.43 Sr 0.23 Na 0.05 K 0.02 ) Σ2.05 (Fe 2+ 0.79 Ti 0.06 Mg 0.05 Al 0.04 Mn 0.03 Zn 0.01 ) Σ0.98 Si 1.97 O 7 . The Raman spectrum of bennesherite exhibits the presence of the main vibrations related to Fe 2+ O 4 tetrahedra and disilicate Si 2 O 7 groups at the T1 and T2...
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Journal Article
Published: 01 June 2012
The Canadian Mineralogist (2012) 50 (3): 593–609.
... groups, each group being linked to three walls. The various minerals differ according to two basic features: (1) the different way of connecting the disilicate groups to the walls of “octahedra” and (2) the cation distributions within the walls ( Merlino & Perchiazzi 1988 ). Merlino...
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Journal Article
Published: 01 October 2011
European Journal of Mineralogy (2011) 23 (5): 837–844.
... disilicate units extending parallel to a . However, in the true structure only each second (Si 2 O 7 ) unit is occupied. Although rusinovite has a stoichiometry similar to the apatite-group mineral nasonite, Pb 6 Ca 4 (Si 2 O 7 ) 3 Cl 2 , the two structures are considerably different. Rusinovite has...
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Journal Article
Published: 01 June 2011
Clays and Clay Minerals (2011) 59 (3): 233–239.
...Mark Ma Abstract Kaolinite is a common gangue mineral in iron ore and sodium silicate has been used widely as a dispersant of silicate gangue minerals including kaolinite in various iron-ore flotation methods over a wide range of pH. Its actual dispersive effect on kaolinite under iron-ore...
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Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 595–608.
... ] ∞ consisting of Si 2 O 7 disilicate groups connected via single BO 2 (OH) 2 tetrahedra, and (II) the interrupted chain (“dotted line”) formed by Si 2 O 6 (OH) disilicate groups bonded to each other by very strong H-bonds. The tetrahedral units I and II are linked to (010) layers of seven-fold coordinated Ca...
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Journal Article
Published: 01 December 2005
The Canadian Mineralogist (2005) 43 (6): 1921–1958.
... techniques have also been used to probe the structure of alkali-containing glasses. Misawa et al. (1980) studied the short-range structure of lithium and sodium disilicate glasses and determined silicon to be tetrahedrally coordinated to four oxygen atoms in these glasses. Misawa et al. (1980) also...
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