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hydrogarnet

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Journal Article
Published: 01 April 2020
American Mineralogist (2020) 105 (4): 468–478.
... of this study, the garnets appear to contain local microscopic- and nano-size Ca 3 Al 2 H 12 O 12 - and Ca 3 Fe 2 3 + H 12 O 12 -like domains and/or clusters dispersed throughout an anhydrous “matrix.” The substitution mechanism is the hydrogarnet one, where (H 4 O 4 ) 4– ↔ (SiO 4 ) 4– , and various local...
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Journal Article
Published: 01 April 2020
American Mineralogist (2020) 105 (4): 455–467.
.... IR single-crystal spectra of several nominally anhydrous calcium silicate garnets, both “end-member” and solid-solution compositions, were recorded at room temperature and 80 K between 3000 and 4000 cm –1 . Five synthetic hydrogarnets in the system Ca 3 Al 2 (SiO 4 ) 3 -Ca 3 Al 2 (H 4 O 4 ) 3 -Ca 3...
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Journal Article
Published: 01 March 2018
American Mineralogist (2018) 103 (3): 384–393.
... as shown by andradite. This behavior is indicative of the hydrogarnet substitution. The measured IR spectra of natural almandine- and pyrope-rich (Dora Maira, Italy) crystals, on the other hand, show different spectroscopic features with several OH – modes that are not consistent with the hydrogarnet...
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Journal Article
Published: 01 July 2017
American Mineralogist (2017) 102 (7): 1402–1417.
... + = H + , Na, K, Li), can occur at the expense of the OH – group coordinating one of the four tetrahedral Si 4+ nearest to the Al 3+ tetrahedron. The most significant feature of the North Sea nano-quartz deduced in the present investigation is the presence of [4H] Si defects, also known as hydrogarnet...
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Journal Article
Published: 01 December 2016
European Journal of Mineralogy (2016) 28 (5): 931–941.
...Taras L. Panikorovskii; Sergey V. Krivovichev; Evgeny V. Galuskin; Vladimir V Shilovskikh; Anton S. Mazur; Ayya V. Bazai Abstract Single crystals of Si-deficient vesuvianite with significant degree of hydrogarnet-type (SiO 4 ) 4− –(O 4 H 4 ) 4− substitution occur as epitactic overgrowth...
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Journal Article
Published: 01 November 2016
American Mineralogist (2016) 101 (11): 2514–2524.
.... Initially formed hydrous stishovite is metastable and dehydrates over time in the low-temperature, high-pressure hydrothermal environment. The primary mechanism of H incorporation in stishovite is a direct substitution of 4H + for Si 4+ yielding unique octahedral hydrogarnet defects. In IR spectra...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 August 2016
Lithosphere (2016) 8 (4): 386–395.
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Journal Article
Published: 01 March 2016
The Canadian Mineralogist (2016) 54 (2): 429–452.
... 2016 © 2016 Mineralogical Association of Canada 2016 metamorphic-hydrothermal Ag-bornite Ag-paolovite argentopentlandite cassiterite chalcopyrite–lenaite Hg-silver mackinawite palladoarsenide parkerite Pd-breithauptite Sb-free paolovite silver Sn-hydrogarnet vincentite...
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Journal Article
Published: 01 November 2015
American Mineralogist (2015) 100 (11-12): 2637–2649.
.... Calculations are performed within the primitive cell of cubic garnets. The hydrogarnet substitution, SiO 4 ↔ H 4 O 4 , yields 136 symmetry-independent configurations ranging from triclinic to cubic symmetry. All of them have been structurally optimized, the relaxed geometries being characterized by pseudo...
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Journal Article
Published: 01 October 2015
Mineralogical Magazine (2015) 79 (5): 1231–1244.
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Journal Article
Published: 01 May 2015
American Mineralogist (2015) 100 (5-6): 1065–1075.
... groups are predicted to be bound to Si vacancies (□) as the hydrogarnet defect, [□ Si +4OH O ] X , at the Si2 tetrahedral site or as the [□ Mg +2OH O ] X defect at the octahedral Mg3 site. The hydrogarnet defect is more favorable than the [□ Mg +2OH O ] X defect by 0.8–1.4 eV/H at 20 GPa. The presence...
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Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2272–2279.
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Journal Article
Journal: Elements
Published: 01 December 2013
Elements (2013) 9 (6): 415–419.
..., garnet can be a storehouse of a significant amount of water as a trace constituent, with concentrations up to 0.1 wt% (e.g. Bell and Rossman 1992 ; Mookherjee and Karato 2010 ). In the crust, garnet occasionally incorporates significant hydroxyl into its tetrahedral structure (e.g. “hydrogarnet...
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Journal Article
Journal: Elements
Published: 01 December 2013
Elements (2013) 9 (6): 447–452.
...? The so-called hydrogarnets form a class of garnet where the central tetrahedrally coordinated Z cation is missing. It is replaced locally by four H + atoms in OH − groups, giving the general formula X 3 Y 2 (□ 3 )H 12 O 12 . Various end-member hydrogarnets have been synthesized in the lab (e.g. Ito...
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Journal Article
Published: 01 December 2013
European Journal of Mineralogy (2013) 25 (4): 631–637.
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Journal Article
Published: 01 August 2013
The Canadian Mineralogist (2013) 51 (4): 597–612.
...-group mineral containing elevated concentrations of Nb (0.20 apfu , 13.33 wt.% Nb 2 O 5 ) and Ti (0.19 apfu Ti, 7.41 wt.% TiO 2 ), and evidence for the (SiO 4 ) 4− ↔ (OH) 4 4− “hydrogarnet” substitution. The crystal structure was solved and refined to R = 3.40% and wR 2 = 9.73% for 68 reflections with F...
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Journal Article
Published: 01 June 2013
The Canadian Mineralogist (2013) 51 (3): 359–375.
... of garnet described by Marincea et al . 2001 ) and titanian andradite replacing perovskite were identified and analyzed ( Marincea et al . 2001 ). As a peculiarity, the garnets from the exoskarn zone have a more significant hydrogarnet component than their counterparts in the endoskarn (see Marincea et...
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Journal Article
Published: 01 April 2013
American Mineralogist (2013) 98 (4): 745–751.
... include: (1) hydrogarnet and partial hydrogarnet-type substitution; (2) H-compensated trivalent substitution at the Si site; and (3) H-compensated trivalent substitution at the Zr site. The results provide a clear picture of the H locations in zircon and their associated IR stretching vibrations. Based...
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Journal Article
Published: 01 July 2012
American Mineralogist (2012) 97 (7): 1252–1255.
..., are important technologically. An additional class is given by the “hydrogarnets” ( Ito and Frondel 1967 ) in which the tetrahedral site (Wyckoff position 24 d ) is empty. Their general formula is given by E 3 G 2 H 12 O 12 . At relatively low temperatures there is complete solid solution between...
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Journal Article
Published: 01 February 2012
American Mineralogist (2012) 97 (2-3): 425–429.
... the hydrogarnet defect. Thus the ability of forsterite to incorporate water is likely to be intimately linked to the nuances of defect chemistry, and to concentrations of impurity elements such as Li + and Al 3+ . * E-mail: feiwu@ivec.org Manuscript handled by Bijaya Karki 13 6 2011 14 11...
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