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Journal Article
Published: 29 July 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (4): 767–785.
... proven to be diamondiferous. In this work, euhedral to anhedral unzoned chromite occurs as cores or irregular inclusions enclosed by uvarovite–grossular mantles. They contain moderate to high Cr (41.63–66.70 wt.% Cr 2 O 3 ; Cr/(Cr+Al) = 0.64–0.99), Fe 2+ (16.71–28.67 wt.% FeO), and Zn (1.64–15.52 wt...
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Journal Article
Published: 01 June 2023
American Mineralogist (2023) 108 (6): 1171–1181.
...-rich, spessartine-rich and grossular-rich garnets, as well as an intermediate almandine-pyrope garnet, were measured. Absorption was observed from roughly 15 000 to 30 000 cm –1 . The spectra were deconvoluted and a very broad band with FWHM values ranging from 5000 to 7000 cm –1 (except in the case...
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Journal Article
Published: 01 March 2023
American Mineralogist (2023) 108 (3): 572–583.
... phase at low temperature, separated by wide miscibility gaps from the pure end-members (grossular and andradite) with cubic structures. Most of the previously reported triclinic garnet structures are likely artifacts produced by pseudo-merohedral twinning of less-ordered orthorhombic structure...
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Journal Article
Published: 01 June 2022
American Mineralogist (2022) 107 (6): 1100–1115.
... is very low in the top layers but high (around 15%) in the bottom part of the cemented mass. At 400 °C, the reaction turnover was only 51% as olivine was stable after plagioclase had reacted away. Clinopyroxene and andradite ± chlorite had formed in the top layers, whereas xonotlite, grossular...
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Journal Article
Published: 01 April 2022
American Mineralogist (2022) 107 (4): 587–602.
... detection analysis (ERDA), secondary ion mass spectrometry (SIMS), and electron probe microanalysis (EPMA) to measure H and F concentrations and constrain incorporation mechanisms in ten grossular garnets. We also present SIMS data for 11 spessartine and two andradite garnets. Three grossular garnets were...
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Journal Article
Published: 01 April 2021
American Mineralogist (2021) 106 (4): 641–649.
... minerals (such as members of the brownmillerite-srebrodolskite series, fluormayenite, lakargiite, baghdadite, hematite, sphalerite, zincite, garnet of the andradite-grossular series, tululite, vapnikite, minerals of the lime-monteponite series and members of the magnesiochromite-zincochromite series...
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Journal Article
Published: 01 February 2021
American Mineralogist (2021) 106 (2): 235–250.
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Journal Article
Published: 01 April 2020
American Mineralogist (2020) 105 (4): 468–478.
...Charles A. Geiger; George R. Rossman Abstract The nominally anhydrous, calcium-silicate garnets, grossular (Ca 3 Al 2 Si 3 O 12 ), andradite (Ca 3 Fe 2 3 + Si 3 O 12 ), schorlomite (Ca 3 Ti 2 4 + [Si, Fe 2 3 + ]O 12 ), and their solid solutions can incorporate structural OH - , often termed “water...
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Journal Article
Published: 01 April 2020
American Mineralogist (2020) 105 (4): 455–467.
...Charles A. Geiger; George R. Rossman Abstract The calcium-silicate garnets, grossular (Ca 3 Al 2 Si 3 O 12 ), andradite (Ca 3 Fe 2 3 + Si 3 O 12 ), and their solid solutions [Ca 3 (Al x , Fe 1 − x 3 + ) 2 Si 3 O 12 ], can incorporate various amounts of structural OH – . This has important...
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Journal Article
Published: 01 October 2019
American Mineralogist (2019) 104 (10): 1455–1468.
...Xianghui Fei; Zhaochong Zhang; Zhiguo Cheng; M. Santosh Abstract The grossular-andradite solid solutions in garnet from skarn deposits in relation to hydrothermal processes and physicochemical conditions of ore formation remain controversial. Here we investigate garnet occurring in association...
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Journal Article
Published: 01 September 2019
American Mineralogist (2019) 104 (9): 1246–1255.
... SiO 4 ], and the garnet series, grossular-andradite [Ca 3 (Al x , Fe 1 − x 3 + ) 2 Si 3 O 12 ], grossular-spessartine [(Ca x , Mn 1 − x 2 + ) 3 Al 2 Si 3 O 12 ], and almandine-spessartine [ ( Fe x 2 + , Mn 1 − x 2 + ) 3 Al 2 Si 3 O 12 ]. Local magnetic behavior of the transition-metal-bearing end...
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Journal Article
Journal: Economic Geology
Published: 01 June 2019
Economic Geology (2019) 114 (4): 745–770.
...- or andradite-grossular solid solution (Ad 68- Ad 72 )–stable assemblages representative of calcic alteration typically occur in deep and/or distal positions but are less commonly exposed. The sodic-calcic and sodic alteration types, however, occur more proximally to the porphyry orebody. Sodic-calcic...
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Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 443–451.
...Edgar Dachs; Charles A. Geiger The thermodynamic behaviour of three synthetic, Ca 3 (Al 0.25 Fe 0.75 3 + ) 2 Si 3 O 12 , Ca 3 (Al 0.50 Fe 0.50 3 + ) 2 Si 3 O 12 and Ca 3 (Al 0.75 Fe 0.25 3 + ) 2 Si 3 O 12 and three grossular-rich natural solid-solution garnets were investigated. Synthetic garnets...
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Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 453–463.
... in the pyrope-rich garnets. Intermediate garnet compositions are more depleted in HREE and enriched in LREE (Ce, Nd, and Sm). Finally, Ca-rich garnets (50% grossular component) are depleted in LREE and HREE, but are enriched in MREE. Hence, the X site dimension does exert a crucial role in REE incorporation...
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Journal Article
Journal: Economic Geology
Published: 01 May 2019
Economic Geology (2019) 114 (3): 513–540.
... gneisses (Thurso gneiss, St. Anne gneiss, western Fiordland orthogneiss) (C). (D) A grossular versus XMg graph provides further subdivision of the gneisses, especially separation of the Otago Schist and Alpine Schist. Abbreviations: Alm = almandine, Grs = grossular, Prp = pyrope, QFS = quartzofeldspathic...
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Journal Article
Published: 01 April 2019
Russ. Geol. Geophys. (2019) 60 (4): 386–399.
... and gehlenite (±rankinite, bredigite); T ≥ 750 °C (spurrite); T ≥ 700 °C (tilleyite, wollastonite, and melilite (Gehl <50 )); and ~500–550 °C (diopside, amphibole, and grossular). Very high temperatures at the contact ( T cont > 2/3 T melt ) result from magma flow along a conduit. The temperature profiles...
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Journal Article
Published: 01 December 2018
American Mineralogist (2018) 103 (12): 1918–1924.
...Chi Ma; John R. Beckett Abstract Nuwaite (Ni 6 GeS 2 , IMA 2013-018) and butianite (Ni 6 SnS 2 , IMA 2016-028) are two new chalcogenide minerals, occurring as micrometer-sized crystals with grossular, Na-bearing melilite, heazlewoodite, and Ge-bearing Ni-Fe alloys in veins and as mono-mineralic...
FIGURES
Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 681–694.
... property behavior. Three issues are: i) Could there be differences in the thermodynamic properties, namely heat capacity, C p , between synthetic and natural andradite crystals, as observed in the Ca-garnet grossular, Ca 3 Al 2 Si 3 O 12 ? ii) What is the thermal nature of the low-temperature magnetic...
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Journal Article
Published: 30 January 2018
The Canadian Mineralogist (2018) 56 (1): 15–37.
... and volcaniclastic sediments in response to Oligo-Miocene intrusion by granitoid porphyries. The KSD contains abundant oscillatory-zoned garnet crystals, which are characterized by isotropic cores of nearly pure andradite that are rimmed by anisotropic grossular–andradite (grandite). The Fe-rich andraditic cores...
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Journal Article
Published: 01 November 2017
American Mineralogist (2017) 102 (11): 2307–2316.
... is weaker in our previous study of pyrope-rich solutions (i.e., Py 80 Gr 20 , Du et al. 2016 ) because excess volume varies little from Ca-Ca S3NN pairings in pyrope-rich solutions, whereas Mg-Mg S3NN pairings in grossular-rich solutions studied here are effective at reducing excess volume. Heating to 600...
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