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1-20 OF 31 RESULTS FOR
guyanaite
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Journal Article
Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 July 2014
American Mineralogist (2014) 99 (7): 1277–1283.
...Daniel J. Schulze; Roberta L. Flemming; Patrick H.M. Shepherd; Herwart Helmstaedt Abstract Guyanaite, naturally occurring β-CrOOH, has been identified in a xenolith of Cr-rich omphacitite from the Moses Rock diatreme in the Navajo Volcanic Field of the southwestern United States. It occurs...
Journal Article
Pressure-induced hydrogen bond symmetrisation in guyanaite, β-CrOOH: evidence from spectroscopy and ab initio simulations
Sandro Jahn, Bernd Wunder, Monika Koch-Müller, Leïla Tarrieu, Michael Pöhle, Anke Watenphul, Michael N. Taran
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 September 2012
European Journal of Mineralogy (2012) 24 (5): 839–850.
...Sandro Jahn; Bernd Wunder; Monika Koch-Müller; Leïla Tarrieu; Michael Pöhle; Anke Watenphul; Michael N. Taran Abstract Guyanaite, β-CrOOH, is a structural analogue of the high-pressure oxyhydroxide phases δ-AlOOH and ɛ-FeOOH. Here, it was synthesized in piston-cylinder and multi-anvil press...
Image
Field of likely equilibration conditions of guyanaite-bearing xenolith (rou...
in Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah
> American Mineralogist
Published: 01 July 2014
Figure 3 Field of likely equilibration conditions of guyanaite-bearing xenolith (rounded rectangle with dark shading). Black dots are estimated equilibration conditions of three phengite eclogites from Smith et al. (2004) . Stability field of guyanaite relative to eskolaite + water (region
Image
SEM image showing the morphology of guyanaite and coesite synthesized at 4 ...
in Pressure-induced hydrogen bond symmetrisation in guyanaite, β-CrOOH: evidence from spectroscopy and ab initio simulations
> European Journal of Mineralogy
Published: 01 September 2012
Fig. 2 SEM image showing the morphology of guyanaite and coesite synthesized at 4 GPa and 600 °C in run LT4 ( Table 1 ).
Journal Article
Study on nanophase iron oxyhydroxides in freshwater ferromanganese nodules from Green Bay, Lake Michigan, with implications for the adsorption of As and heavy metals
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 September 2016
American Mineralogist (2016) 101 (9): 1986–1995.
... goethite, two-line ferrihydrite, and nanophase FeOOH with guyanaite structure. Z-contrast images of the Fe-oxyhydroxides show ordered FeOOH nano-domains with guyanaite structure intergrown with nanophase goethite. The FeOOH nanophase is a precursor to the goethite. Henceforth, we will refer to it as “proto...
Journal Article
Structures and energies of AlOOH and FeOOH polymorphs from plane wave pseudopotential calculations
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 March 2001
American Mineralogist (2001) 86 (3): 312–317.
...Kevin M. Rosso; James R. Rustad Abstract Plane wave pseudopotential methods are used to investigate the structures and total energies of AlOOH and FeOOH in the five canonical oxyhydroxide structures: diaspore (goethite), boehmite (lepidocrocite), akaganeite, guyanaite, and grimaldiite. The local...
Image
Fundamental octahedra for ( a ) boehmite/lepidocrocite; ( b ) grimaldiite; ...
in Structures and energies of AlOOH and FeOOH polymorphs from plane wave pseudopotential calculations
> American Mineralogist
Published: 01 March 2001
F igure 2. Fundamental octahedra for ( a ) boehmite/lepidocrocite; ( b ) grimaldiite; ( c ) guyanaite; ( d ) diaspore/goethite; ( e ) akaganeite. Bond lengths and angles are defined and listed in Table 1 .
Image
Polyhedral frameworks for ( a ) boehmite/lepidocrocite viewed down [100]; (...
in Structures and energies of AlOOH and FeOOH polymorphs from plane wave pseudopotential calculations
> American Mineralogist
Published: 01 March 2001
F igure 1. Polyhedral frameworks for ( a ) boehmite/lepidocrocite viewed down [100]; ( b ) grimaldiite [100]; ( c ) guyanaite [001]; ( d ) diaspore/goethite [010] (Pnma setting); ( e ) akaganeite [001]. Dark spheres represent oxygen atoms, light spheres represent hydrogen atoms.
Image
Backscatter electron (BSE) image of a portion of a cluster of accessory min...
in Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah
> American Mineralogist
Published: 01 July 2014
Figure 1 Backscatter electron (BSE) image of a portion of a cluster of accessory minerals in sample 12-90-50. Phases labeled are guyanaite (guy), eskolaite (es), carmichaelite (carm), and chromite (cht). These phases are set in a matrix of omphacite that appears very dark gray in this image
Image
In situ μXRD of accessory minerals from clusters in sample 12-90-50. ( a ) ...
in Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah
> American Mineralogist
Published: 01 July 2014
data; the bright spots indicate larger crystallites and streaks indicate slight dispersion of crystallite orientation likely due to intergrowth of kosmochlor (kos) and guyanaite (guy). The absence of complete Debye rings indicates that these crystallites do not occur in a random distribution
Image
Pressure-Temperature diagram showing experimental results from this study (...
in Pressure-induced hydrogen bond symmetrisation in guyanaite, β-CrOOH: evidence from spectroscopy and ab initio simulations
> European Journal of Mineralogy
Published: 01 September 2012
Fig. 3 Pressure-Temperature diagram showing experimental results from this study ( P ≥ 4 GPa) and from Tombs et al. (1964) and Nørlund Christensen et al. (1976) ( P < 0.3 GPa). Filled squares represent synthesis of guyanaite, open squares represent formation of eskolaite
Image
fEDT screening on two crystal aggregates. In the two boxes the bright-field...
in Electron diffraction determination of 11.5 Å and HySo structures: Candidate water carriers to the Upper Mantle
> American Mineralogist
Published: 01 December 2016
, 11.5 = 11.5 Å phase, Gu = guyanaite). All the investigated crystals have a size of 500 nm or smaller and are in contact with other crystals requiring a remarkable goniometer for an automatic fEDT data collection. (Color online.)
Journal Article
The 7 th European Conference on Mineralogy and Spectroscopy Preface
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 September 2012
European Journal of Mineralogy (2012) 24 (5): 775–776.
... transitions in ilvaite (Koch-Müller et al.), and a combined computational and experimental investigation of pressure-induced hydrogen-bond symmetrization in guyanaite (Jahn et al.). Wentzcovitch et al. present a thorough state of the art review of the interpretation of pressure-induced Fe spin crossover...
Journal Article
Electron diffraction determination of 11.5 Å and HySo structures: Candidate water carriers to the Upper Mantle
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 December 2016
American Mineralogist (2016) 101 (12): 2645–2654.
..., 11.5 = 11.5 Å phase, Gu = guyanaite). All the investigated crystals have a size of 500 nm or smaller and are in contact with other crystals requiring a remarkable goniometer for an automatic fEDT data collection. (Color online.) ...
Journal Article
Timing of the Cenozoic “Great Hydration” event beneath the Colorado Plateau: Th-Pb dating of monazite in Navajo volcanic field metamorphic eclogite xenoliths
Journal: Geology
Publisher: Geological Society of America
Published: 01 August 2015
Geology (2015) 43 (8): 727–730.
... of the Colorado Plateau uplift: Initial constraints from vesicular basalt-derived paleoelevations : Geology , v. 30 , p. 807 – 810 , doi:10.1130/0091-7613(2002)030<0807:TOCPUI>2.0.CO;2. Schulze D.J. Flemming R.L. Shepherd P.H.M. Helmstaedt H. , 2014 , Mantle-derived guyanaite...
Journal Article
Solid Solutions of Karelianite and Eskolaite (Slyudyanka Complex, Southern Baikal Area): Genesis and a Possible Petrogenetic Indicator
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 November 2019
Russ. Geol. Geophys. (2019) 60 (11): 1229–1246.
... in mantle inclusions of omphacite pyroxenite, resulted from complex postmagmatic alteration of the host rock: metamorphism, metasomatism, as well as hydration and subsequent dehydration of guyanaite (a hydrous oxide) in a subduction setting at T 650–800 °C ( Schulze et al., 2014 ). Relatively low...
Journal Article
Thermal and nuclear quantum effects in the hydrogen bond dynamical symmetrization phase transition of δ-AlOOH
Journal: European Journal of Mineralogy
Publisher: GeoScienceWorld Journals
Published: 01 June 2017
European Journal of Mineralogy (2017) 29 (3): 385–395.
... effects, the experiments could be ideally conducted on both AlOOD and AlOOH. Our results might also be relevant for other hydrous minerals, such as guyanaite ( Jahn et al. , 2012 ) or dense hydrous magnesium silicates ( Ohira et al. , 2014 ; Tsuchiya, 2013 ), where nuclear quantum effects...
Journal Article
In-situ infrared spectroscopic studies of hydroxyl in amphiboles at high pressure
Journal: American Mineralogist
Publisher: Mineralogical Society of America
Published: 01 March 2016
American Mineralogist (2016) 101 (3): 706–712.
... . Physics and Chemistry of Minerals , 36 , 343 – 354 . Jahn S. Wunder B. Koch-Müller M. Tarrieu L. Pohle M. Watenphul A. Taran M.N. ( 2012 ) Pressure-induced hydrogen bond symmetrization in guyanaite, beta-CrOOH: evidence from spectroscopy and ab initio simulations...
Journal Article
Geochemistry of detrital zinc-rich chromite in conglomerates from eastern India
Dipak C Pal, Biplab Chandra Sarkar, Sarthak Ghosh, Rahul Sen, Ashim Jana, Soumik Mukhopadhyay, Deepak K Sinha
Journal: Mineralogical Magazine
Published: 18 February 2022
Mineralogical Magazine (2022) 86 (2): 214–221.
... of Singhbhum North Orissa Eastern India . Geological Society of India , Memoir 27. Pp. 341. Schulze D.J. , Flemming R.L. , Shepherd P.H.M. and Helmstaedt H. ( 2014 ) Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah . American Mineralogist , 99...
Journal Article
Vanadian–Chromian Spinels (Sludyanka Metamorphic Complex, South Baikal Area). Magnesian Spinel
Journal: Russian Geology and Geophysics
Publisher: Novosibirsk State University
Published: 01 June 2024
Russ. Geol. Geophys. (2024) 65 (6): 699–713.
..., CrO(OH) polymorphs: bracewellite, grimaldiite, and guyanaite, all with Cr 3+ , encountered in merumite (hydrothermally altered cinder and sandstone). These minerals can bear minor V but, judging by field and laboratory data, they crystallize at temperatures of 140 °C and higher, which rules out...
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