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Polymorphism of celsian

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Journal Article
Published: 01 February 1968
American Mineralogist (1968) 53 (1-2): 134–144.
...H. C. Lin; W. R. Foster Abstract Prolonged anhydrous and hydrothermal heating experiments made with natural and synthetic materials have confirmed the following polymorphic relations: Monoclinic celsian is stable from room temperature up to 1590°C, where it inverts sluggishly and re-versibly...
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MSI in garnet. ( a ) Part of a garnet porphyroblast with chains of carbonat...
Published: 01 October 2023
Figure 4. MSI in garnet. ( a ) Part of a garnet porphyroblast with chains of carbonate-rich inclusions accompanied by MSI. ( b ) MSI containing dolomite, magnesite, apatite, mica, and monazite. ( c ) MSI containing undefined SiO 2 polymorph, dolomite, apatite, clinopyroxene, epidote
Journal Article
Published: 01 February 1974
American Mineralogist (1974) 59 (1-2): 139–142.
...Dov Bahat Abstract Hexagonal BaAl 2 Si 2 O 8 , nucleated by ZnS impurities, has been grown in glassafter heat treatment at 1000°C. Further annealing at the same temperature causes a polymorphic phase transformation to the monoclinic barium feldspar, celsian. This transformation is accompanied...
Journal Article
Published: 12 September 2019
Mineralogical Magazine (2019) 83 (6): 821–827.
... are alstonite, baryte, celsian, diopside, fresnoite, mica, suzukiite, walstromite, witherite and minerals of the cerchiaraite group. Bavsiite is optical uniaxial (+), with ω = 1.725(3) and ε = 1.750(3) (589 nm) and pleochroic. Electron microprobe analyses yielded the empirical formula Na 0.02 Ba 1.98 Ti 0.16 Fe...
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Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2272–2279.
... symmetry. However, even triclinic polymorphs of hyalophane (with < Cn 30 ) were found in nature ( Gay and Roy 1968 ). Celsian structure resembles monoclinic body-centered Si-Al unit cells of anorthite, in which an addition of relatively small Ca 2+ leads to distortion of framework and origin...
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Journal Article
Published: 01 July 2015
American Mineralogist (2015) 100 (7): 1533–1543.
...Stephen M. Seddio; Randy L. Korotev; Bradley L. Jolliff; Alian Wang Abstract Granitic lunar samples largely consist of granophyric intergrowths of silica and K-feldspar. The identification of the silica polymorph present in the granophyre can clarify the petrogenesis of the lunar granites...
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Journal Article
Published: 01 September 2016
The Canadian Mineralogist (2016) 54 (5): 1129–1146.
... ). The polymorphism of SrAl 2 Si 2 O 8 has a similar character to that reported for BaAl 2 Si 2 O 8 ( McCauley 2000 ). When heated, the slawsonite transitions at 500 °C (or at 600 °C, Bambauer & Nager 1981 ) to a monoclinic variety (the Sr analogue of celsian), which is stable to a melting temperature of 1650...
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Journal Article
Published: 01 August 2001
The Canadian Mineralogist (2001) 39 (4): 1039–1051.
... , H.C. & Foster , W.R. ( 1968 ): Studies in the system BaO–Al 2 O 3 –SiO 2 . I. The polymorphism of celsian . Am. Mineral . 53 , 134 – 144 . Matsubara , S. ( 1985 ): The mineralogical implication of barium and strontium silicates . Bull. Nat. Sci. Mus. Tokyo, Ser . C 11 ( 2...
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Journal Article
Published: 01 August 2017
Mineralogical Magazine (2017) 81 (4): 1009–1019.
..., 2014 ). Synthetic polymorphs of celsian and paracelsian with layered structure represented by two structural modifications: α and β, distinguished by the degree of order, are called ‘hexacelsian’ ( Yoshiki and Matsumoto, 1951 ; Smith, 1953 ; Takeuchi, 1958 ; Takeuchi and Donnay, 1959 ; Müller, 1977...
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Journal Article
Published: 01 July 2005
European Journal of Mineralogy (2005) 17 (4): 515–535.
..., pegmatites and felsic volcanic rocks. Celsian (Cn, BaAl 2 Si 2 O8) has a structure similar to that of anorthite but with significant Al and Si disorder ( Griffen & Ribbe, 1976 ). It has a polymorph, paracelsian, with a different space group, isostructural with danburite (CaB 2 Si 2 O 8 ) ( Chiari et al...
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Journal Article
Published: 01 October 2023
American Mineralogist (2023) 108 (10): 1840–1851.
...Figure 4. MSI in garnet. ( a ) Part of a garnet porphyroblast with chains of carbonate-rich inclusions accompanied by MSI. ( b ) MSI containing dolomite, magnesite, apatite, mica, and monazite. ( c ) MSI containing undefined SiO 2 polymorph, dolomite, apatite, clinopyroxene, epidote...
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Journal Article
Journal: Clay Minerals
Published: 01 September 2018
Clay Minerals (2018) 53 (3): 403–412.
...°C (Semler & Foster, 1970 ), existing primarily in three different polymorphic forms: celsian or monocelsian (monoclinic), hexacelsian (hexagonal) and α-hexacelsian (orthorhombic). Hexacelsian is thermodynamically stable at temperatures between 1590°C and the melting point, whereas celsian...
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Journal Article
Published: 01 August 2023
Russ. Geol. Geophys. (2023) 64 (8): 950–961.
...-temperature powder X-ray diffraction) provided. The high-temperature studies of 5 feldspar minerals with paracelsian topology (danburite, maleevite, pekovite, paracelsian, slawsonite) revealed that all of them are stable at least up to 800 °C. Among all of them only paracelsian undergoes polymorphic...
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Journal Article
Published: 01 February 2003
The Canadian Mineralogist (2003) 41 (1): 234–235.
... caused by order–disorder and incommensurate structures, respectively, are not polymorphs as claimed on page 6. Some common chemical ( e.g. , ferro, magnesio) and crystallographic ( e.g. , klino, para) prefixes are hyphenated from the rest of the mineral name. A mineral name cannot be subdivided...
Journal Article
Published: 15 February 2021
Mineralogical Magazine (2021) 85 (2): 224–232.
... oxide deposit, in Värmland, Sweden, representing intermediate compositions on the walstromite–margarosanite binary, in the range ca. 50–70% mol.% BaCa 2 Si 3 O 9 . The Pb-rich walstromite is associated closely with celsian, phlogopite, andradite, vesuvianite, diopside and nasonite. A crystal-structure...
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Journal Article
Published: 01 August 2017
Mineralogical Magazine (2017) 81 (4): 949–974.
..., celsian, hyalophane, Ba-orthoclase and fresnoite, but before nepheline ± kalsilite, and later sulfates, carbonates, an unidentified ‘X-mineral’ close to Al- and Fe-rich tobermorite and goethite. Micro-Raman spectroscopy of kuratite shows five bands near 133–155 (strong), 399–401, 545–566, 684–693...
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Journal Article
Published: 01 June 2001
The Canadian Mineralogist (2001) 39 (3): 761–768.
... within foliated quartzite at or within 100 m of the contact with a granodiorite pluton. The Big Creek site is the type locality for alforsite and walstromite and is known for several rare minerals including anandite, bazirite, benitoite, celsian, gillespite, fresnoite, muirite, macdonaldite, pellyite...
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Journal Article
Published: 01 May 2021
American Mineralogist (2021) 106 (5): 730–761.
... ) Tridymite (SiO 2 ) DA tridymite Tridymite is the commonest silica polymorph; it is found in iron meteorites and in mafic meteorite lithologies 1,4,48,71,77 Cristobalite (SiO 2 ) DA cristobalite A minor phase in eucrites, aubrites, and iron meteorites 27,78,79 Quartz (SiO 2 ) DA quartz...
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Journal Article
Published: 01 July 2013
American Mineralogist (2013) 98 (7): 1368–1371.
... of STP- 1. Dmisteinbergite is 1 of 10 refractory silicates identified in refractory inclusions to date. Dmisteinbergite (hexagonal), svyatoslavite (monoclinic), and anorthite (triclinic) are polymorphs of CaAl 2 Si 2 O 8 . Dmisteinbergite has a layered structure, stacking double sheets of 6-membered...
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Journal Article
Published: 01 December 2023
Russ. Geol. Geophys. (2023) 64 (12): 1408–1429.
... in melilite–nepheline paralava, have been studied in terms of chemistry and mineralogy. The obtained data on rock-forming, minor, accessory, and rare phases (silica polymorphs, cordierite-group minerals, fayalite, Fe and Ti oxides, ferrosilite, etc.) have implications for the formation conditions...
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