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hydrogarnet

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Journal Article
Published: 01 June 2021
American Mineralogist (2021) 106 (6): 953–963.
.... Correlations among the constituents of ferrihydrite determined by electron microprobe, including anhydrous totals, indicate progress during the growth of two charge-balanced exchanges involving silica enrichment: an inverse cronstedtite substitution (MgFe 2+ ,Si) (Fe 3+ Mn 3+ ) –2 and an inverse 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.
...-hydrogarnet vincentite vysotskite The problem of remobilized ore concentrations, which was set by Hans Schneiderhöhn (1958) more than a half-century ago, remains insufficiently understood. Fundamentally, this is a problem of links between metamorphism and ore formation, i.e ., the origin...
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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.
... 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”; Rossman and Aines 1991 ; Grew et al. 2013 ). In this case, hydroxyl...
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Journal Article
Journal: Elements
Published: 01 December 2013
Elements (2013) 9 (6): 447–452.
... and industrial areas because of their magnetic, optical, lasing, and ion-conducting properties. Research on garnet is multidisciplinary and involves scientists in the materials and mineral sciences, physical and inorganic chemistry, and solid-state physics. The so-called hydrogarnets form a class of garnet...
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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.
.... A more extensive description of the mineral was offered by Marincea et al . (2001 , 2011 ), who gives chemical, crystallographic, and physical data. In many cases, the crystals of gehlenite from the exoskarn are embedded and partially engulfed by vesuvianite or hydrogarnet ( Fig. 1C ) as a result...
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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.
... Society of America 2012 Katoite hydrogarnet heat capacity standard entropy Gibbs free energy relaxation calorimetry hydrous minerals cement The garnet class of phases is extremely broad in terms of composition and structural properties. Garnet is found in nature and various synthetic...
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