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corundum

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Journal Article
Published: 01 August 2022
American Mineralogist (2022) 107 (8): 1575–1581.
... (NaAlSi 3 O 8 ) = jadeite (NaAlSi 2 O 6 ) + quartz (SiO 2 ) reaction at 800 and 1000 °C ( Holland 1980 ) using BaCO 3 cells. Third, we investigated the anorthite (CaAl 2 Si 2 O 8 ) + gehlenite (Ca 2 Al 2 SiO 7 ) + corundum (Al 2 O 3 ) = kushiroite (3CaAl 2 SiO 6 ) reaction ( Hays 1966a , 1966b...
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Journal Article
Published: 01 March 2022
American Mineralogist (2022) 107 (3): 532–549.
...William L. Griffin; Sarah E.M. Gain; Martin J. Saunders; Jin-Xiang Huang; Olivier Alard; Vered Toledo; Suzanne Y. O'Reilly Abstract Xenolithic corundum aggregates in Cretaceous mafic pyroclastics from Mount Carmel contain pockets of silicate melts with mineral assemblages [SiC (moissanite), TiC, Ti...
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Journal Article
Published: 07 February 2022
The Canadian Mineralogist (2022) 60 (1): 3–28.
... by detailed petrography, Raman spectroscopy, microthermometry, and in situ titanite laser ablation-inductively coupled plasma-mass spectrometry dating. Some fluid inclusions in the corundum show an interesting morphology with a diaspore crystal fully separating the whole inclusion into two smaller inclusions...
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Journal Article
Published: 03 January 2022
American Mineralogist (2022) 107 (1): 43–53.
... , constitute four inclusions up to 50 μm across in corundum recovered from the Cr-11 podiform chromitite orebody near Kangjinla, Luobusa ophiolite, Tibet, China. EELS, EDS, and 3D electron diffraction were applied to study the phases. In one inclusion, jingsuiite forms a rounded grain 40 μm across. Associated...
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Journal Article
Published: 01 September 2021
American Mineralogist (2021) 106 (9): 1420–1437.
... stages of their evolution, recording a continuous decrease in oxygen fugacity ( f O 2 ) as crystallization proceeded. Corundum coexisting with Fe-Mg-Cr-Al spinels, other Fe-Mg-Al-Na oxides, and Fe-Ni alloys in apparent cumulates crystallized at f O 2 values near the iron-wüstite (IW) buffer ( f O 2 = IW...
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Journal Article
Published: 01 April 2021
American Mineralogist (2021) 106 (4): 559–569.
...Xi-Sheng Xu; Xiao-Ming Chen; William L. Griffin; Suzanne Y. O'Reilly; Xi-Song Zhang; Li-Hui Chen Abstract Controversies on the origin of zircon, corundum, titanomagnetite, and quartz megacrysts in alkali basalts mostly reflect the lack of direct evidence of a “melt reservoir” required...
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Journal Article
Published: 01 January 2021
American Mineralogist (2021) 106 (1): 44–53.
... of diamond and deltalumite from Koryaksky volcano; coexistence with super-reduced corundum and moissanite, Mn-Ni silicide inclusions, F-Cl enrichment and F/Cl ratios, and carbon and nitrogen isotopes in Tolbachik diamonds, as well as microtwinning, Mn-Ni silicides, and other inclusions in microcrystalline...
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Journal Article
Published: 01 November 2020
American Mineralogist (2020) 105 (11): 1656–1661.
... basalt, gabbro, noritic orthopyroxenite, orthopyroxenite, dunite, harzburgite, and dacite. No other lithology has been reported up to date. In this study, we report a new occurrence of corundum in eucrite meteorite Northwest Africa (NWA) 8647. Three-dimensional petrographic observations reveal...
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Journal Article
Published: 01 November 2020
American Mineralogist (2020) 105 (11): 1609–1621.
...William L. Griffin; Sarah E.M. Gain; Martin Saunders; Luca Bindi; Olivier Alard; Vered Toledo; Suzanne Y. O'Reilly Abstract Titanium diboride (TiB 2 ) is a minor but common phase in melt pockets trapped in the corundum aggregates that occur as xenoliths in Cretaceous basaltic volcanoes on Mt...
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Journal Article
Published: 01 August 2020
American Mineralogist (2020) 105 (8): 1161–1174.
...Shreya Karmakar; Subham Mukherjee; Upama Dutta Abstract Growth of corundum in metamorphosed anorthosites and related basic-ultra-basic rocks is an exceptional feature, and its origin remains elusive. We describe the occurrence of and offer an explanation for the genesis of corundum in anorthositic...
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Journal Article
Published: 01 May 2020
American Mineralogist (2020) 105 (5): 627–651.
... evolution mineral ecology natural kinds vapor deposition condensation astromineralogy stardust diamond graphite corundum moissanite hibonite amorphous phases “ The science of Mineralogy has made rapid progress in the past six years; chemistry has opened to us a better knowledge...
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Journal Article
Published: 01 July 2019
American Mineralogist (2019) 104 (7): 980–995.
..., ilmenite, and apatite lamellae in garnet from the Brimfield Schist, Connecticut (≥1000 °C metamorphism; Central Maine Terrane, U.S.A.). We analyzed these data alongside published EBSD data for rutile, ilmenite, and corundum from metapegmatites metamorphosed in the eclogite facies from the Austrian Alps...
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Journal Article
Published: 01 July 2019
European Journal of Mineralogy (2019) 31 (4): 739–753.
...Barbara L. Dutrow; Darrell J. Henry; Ziyin Sun Infiltration of out-of-equilibrium fluids can lead to extensive fluid–rock interactions resulting in unusual and uncommon mineral assemblages that are petrologically and mineralogically important. The corundum (cor)–tourmaline (tur)–phlogopite rocks...
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Journal Article
Published: 01 April 2019
Mineralogical Magazine (2019) 83 (2): 249–260.
...J. Victor Owen; Jacob J. Hanley; Mitchell J. Kerr; Matthew Stimson; Brandon Boucher Abstract Frenchvale quarry, once mined for dolomitic marble, contains pink corundum-bearing, quartz-free/-poor, feldspathic gneiss that is unusually sodic (~7% wt.% Na 2 O) and iron-poor (~0.6 wt.% Fe 2 O 3...
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Journal Article
Published: 01 February 2019
American Mineralogist (2019) 104 (2): 207–219.
... of hopper/skeletal Ti-rich corundum, which have trapped melts that crystallized at f O 2 extending from 7 log units below the iron-wustite buffer (ΔIW = –7; SiC, Ti 2 O 3 , Fe-Ti silicide melts) to ΔIW ≤ –9 (native V, TiC, and TiN). The assemblage hibonite + grossite + spinel + TiN first crystallized late...
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Journal Article
Published: 01 February 2019
Mineralogical Magazine (2019) 83 (1): 123–135.
...Victor V. Sharygin Abstract The intergrowths of Fe-rich corundum + Al-rich hematite + spinel + hibonite have been found as an assemblage in a plagioclase-clinopyroxene rock (paralava, former hornfels) at the Hatrurim Basin, Hatrurim combustion metamorphic Formation. Most spinels show oriented...
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Journal Article
Published: 01 November 2018
American Mineralogist (2018) 103 (11): 1851–1868.
... underutilized potential for pinpointing peak metamorphic conditions, particularly pressure, because of their resilience to melting and the variety of refractory minerals they contain. The typical silica-undersaturated mineral assemblage is garnet + spinel + corundum + plagioclase + K-feldspar + biotite...
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Journal Article
Published: 01 November 2018
European Journal of Mineralogy (2018) 30 (6): 1063–1070.
...Dmitry P. Krylov; Robert A. Evarestov Equilibrium oxygen isotope ( 18 O/ 16 O) fractionations ( β -factors) for corundum are predicted from first principles using the “frozen phonon” technique within the density functional theory (DFT). Calculations of the phonon frequencies and the isotopic...
FIGURES
Journal Article
Published: 01 March 2018
American Mineralogist (2018) 103 (3): 469–479.
..., and oxygen isotope ratios in blue to reddish-violet sapphires from Yogo Gulch, Montana, U.S.A., with rubies from the Chantaburi-Trat region of Thailand and the Pailin region of Cambodia. The similarities between Thai/Cambodian rubies and Yogo sapphires suggest a common origin for gem corundum from both...
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Journal Article
Published: 01 December 2017
American Mineralogist (2017) 102 (12): 2521–2522.
... ) Heat treating the sapphires of Rock Creek, Montana . Gems & Gemology , 29/4 , 250 – 272 . Guo , J. , O'Reilly , S.Y. , and Griffin , W.L. ( 1996 ) Corundum from basaltic terrains: a mineral inclusion approach to the enigma . Contributions to Mineralogy and Petrology , 122...