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post-spinel structure

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Journal Article

High-pressure phase transitions in FeCr 2 O 4 and structure analysis of new post-spinel FeCr 2 O 4 and Fe 2 Cr 2 O 5 phases with meteoritical and petrological implications

Takayuki Ishii, Hiroshi Kojitani, Shoichi Tsukamoto, Kiyoshi Fujino, Daisuke Mori, Yoshiyuki Inaguma, Noriyoshi Tsujino, Takashi Yoshino, Daisuke Yamazaki, Yuji Higo, Kenichi Funakoshi, Masaki Akaogi
Published: 01 August 2014
American Mineralogist (2014) 99 (8-9): 1788–1797.
DOI: https://doi.org/10.2138/am.2014.4736
... relations also suggest that the natural chromitites in the Luobusa ophiolite previously interpreted as formed in the deep-mantle were formed at pressure below 12–16 GPa. Post-spinel Rietveld analysis crystal structure high pressure phase transition shocked meteorite FeCr 2 O 4 ophiolite...
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View PDF for article title, High-pressure phase transitions in FeCr 2 O 4 and <span class="search-highlight">structure</span> analysis of new <span class="search-highlight">post</span>-<span class="search-highlight">spinel</span> FeCr 2 O 4 and Fe 2 Cr 2 O 5 phases with meteoritical and petrological implications
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Image
(a) Ellinaite post-spinel structure, projection perpendicular to the tunnel direction (different octahedral sites are CrM1 = light-green and CrM2 = dark-green, Ca sites drawn in orange). (b) Ca sites (orange balls) in tunnel coordinated by O (red). Rutile-like chains of two types of octahedra: CrM1 (light-green) and CrM2 (dark-green) are shown.

(a) Ellinaite post-spinel structure, projection perpendicular to the tunnel...

Published: 17 March 2021
Fig. 5. (a) Ellinaite post-spinel structure, projection perpendicular to the tunnel direction (different octahedral sites are Cr M 1 = light-green and Cr M 2 = dark-green, Ca sites drawn in orange). (b) Ca sites (orange balls) in tunnel coordinated by O (red). Rutile-like chains of two types
Image
Low-pressure minerals with post-spinel structure, projection perpendicular to the tunnel direction (different octahedral sites marked with different colours, Ca sites drawn in orange): (A) marokite (Zouari et al., 2003), (B) harmunite (Galuskina et al., 2014), (C) wernerkrauseite; (D) Ca sites in tunnels coordinated by O (red balls): I – marokite, II – harmunite, III – wernerkrauseite with Ca sites doubling with 1/3 occupation, IV – monoclinic synthetic CaMn3O6 with Ca sites ordering (Hadermann et al., 2006).

Low-pressure minerals with post-spinel structure, projection perpendicular ...

Published: 01 May 2016
Fig. 3 Low-pressure minerals with post-spinel structure, projection perpendicular to the tunnel direction (different octahedral sites marked with different colours, Ca sites drawn in orange): (A) marokite ( Zouari et al ., 2003 ), (B) harmunite ( Galuskina et al ., 2014 ), (C) wernerkrauseite
Journal Article

High-pressure phase transitions of Fe 3–x Ti x O 4 solid solution up to 60 GPa correlated with electronic spin transition

Takamitsu Yamanaka, Atsushi Kyono, Yuki Nakamoto, Yue Meng, Svetlana Kharlamova, Victor V. Struzhkin, Ho-kwang Mao
Published: 01 April 2013
American Mineralogist (2013) 98 (4): 736–744.
DOI: https://doi.org/10.2138/am.2013.4182
... with Fe 2+ in the fourfold- or eightfold-coordinated site. The transition to the orthorhombic post-spinel structure with space group Cmcm has been confirmed in the whole compositional range of Fe 3–x Ti x O 4 . The transition pressure decreases from 25 GPa (x = 0.0) to 15 GPa (x = 1.0) with increasing Ti...
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View PDF for article title, High-pressure phase transitions of Fe 3–x Ti x O 4 solid solution up to 60 GPa correlated with electronic spin transition
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Journal Article

Wernerkrauseite, CaFe 3+ 2 Mn 4+ O 6 : the first nonstoichiometric post-spinel mineral, from Bellerberg volcano, Eifel, Germany

Evgeny V. Galuskin, Biljana Krüger, Hannes Krüger, Günter Blass, Remo Widmer, Irina O. Galuskina
Published: 01 May 2016
European Journal of Mineralogy (2016) 28 (2): 485–493.
DOI: https://doi.org/10.1127/ejm/2016/0028-2509
...Fig. 3 Low-pressure minerals with post-spinel structure, projection perpendicular to the tunnel direction (different octahedral sites marked with different colours, Ca sites drawn in orange): (A) marokite ( Zouari et al ., 2003 ), (B) harmunite ( Galuskina et al ., 2014 ), (C) wernerkrauseite...
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View PDF for article title, Wernerkrauseite, CaFe 3+ 2 Mn 4+ O 6 : the first nonstoichiometric <span class="search-highlight">post</span>-<span class="search-highlight">spinel</span> mineral, from Bellerberg volcano, Eifel, Germany
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Image
Thermal fields output from our numerical model showing the evolution of a subducted slab within the mantle. The thick black line denotes the position of the endothermic phase change from spinel to post-spinel structures at approximately 660 km depth.

Thermal fields output from our numerical model showing the evolution of a s...

Published: 20 October 2000
Fig. 3. Thermal fields output from our numerical model showing the evolution of a subducted slab within the mantle. The thick black line denotes the position of the endothermic phase change from spinel to post-spinel structures at approximately 660 km depth.
Journal Article

Phase transitions and equation of state of forsterite to 90 GPa from single-crystal X-ray diffraction and molecular modeling

Gregory J. Finkelstein, Przemyslaw K. Dera, Sandro Jahn, Artem R. Oganov, Christopher M. Holl, Yue Meng, Thomas S. Duffy
Published: 01 January 2014
American Mineralogist (2014) 99 (1): 35–43.
DOI: https://doi.org/10.2138/am.2014.4526
... by displacement in [001](100). The forsterite III structure is a member of the family of post-spinel structures adopted by compositions such as CaFe 2 O 4 and CaTi 2 O 4 . * E-mail: [email protected] Manuscript handled by G. Diego Gatta Compressibility measurements olivine forsterite...
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View PDF for article title, Phase transitions and equation of state of forsterite to 90 GPa from single-crystal X-ray diffraction and molecular modeling
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Journal Article

Equation of state of the high-pressure Fe 3 O 4 phase and a new structural transition at 70 GPa

Angele Ricolleau, Yingwei Fei
Published: 01 March 2016
American Mineralogist (2016) 101 (3): 719–725.
DOI: https://doi.org/10.2138/am-2016-5409
.... At a pressure between 64 and 73 GPa, a new structural transition was observed in Fe 3 O 4 , which can be attributed to a martensitic transformation as described by Yamanaka et al. (2008) for post-spinel structural transition. The diffraction data can be best fitted with a Pnma space group. No breakdown of Fe 3...
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View PDF for article title, Equation of state of the high-pressure Fe 3 O 4 phase and a new <span class="search-highlight">structural</span> transition at 70 GPa
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Structure comparison of the three post-spinel phases. All orthorhombic structures have the second lattice setting. Ti, Mn, and Fe atoms are in sixfold coordination, and Ca is in eightfold coordination.

Structure comparison of the three post-spinel phases. All orthorhombic stru...

Published: 01 November 2008
F igure 2. Structure comparison of the three post-spinel phases. All orthorhombic structures have the second lattice setting. Ti, Mn, and Fe atoms are in sixfold coordination, and Ca is in eightfold coordination.
Journal Article

Structural and chemical characterization of Mg[(Cr,Mg)(Si,Mg)]O 4 , a new post-spinel phase with sixfold-coordinated silicon

Luca Bindi, Ekaterina A. Sirotkina, Andrey V. Bobrov, Tetsuo Irifune
Published: 01 July 2015
American Mineralogist (2015) 100 (7): 1633–1636.
DOI: https://doi.org/10.2138/am-2015-5322
...Luca Bindi; Ekaterina A. Sirotkina; Andrey V. Bobrov; Tetsuo Irifune Abstract The crystal structure and chemical composition of a crystal of Mg(Mg,Cr,Si) 2 O 4 post-spinel phase synthesized in the model system MgCr 2 O 4 –Mg 2 SiO 4 at 16 GPa and 1600 °C have been investigated. The compound...
FIGURES
View PDF for article title, <span class="search-highlight">Structural</span> and chemical characterization of Mg[(Cr,Mg)(Si,Mg)]O 4 , a new <span class="search-highlight">post</span>-<span class="search-highlight">spinel</span> phase with sixfold-coordinated silicon
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Journal Article

Structural transition of post-spinel phases CaMn 2 O 4 , CaFe 2 O 4 , and CaTi 2 O 4 under high pressures up to 80 GPa

T. Yamanaka, A. Uchida, Y. Nakamoto
Published: 01 November 2008
American Mineralogist (2008) 93 (11-12): 1874–1881.
DOI: https://doi.org/10.2138/am.2008.2934
...F igure 2. Structure comparison of the three post-spinel phases. All orthorhombic structures have the second lattice setting. Ti, Mn, and Fe atoms are in sixfold coordination, and Ca is in eightfold coordination. ...
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View PDF for article title, <span class="search-highlight">Structural</span> transition of <span class="search-highlight">post</span>-<span class="search-highlight">spinel</span> phases CaMn 2 O 4 , CaFe 2 O 4 , and CaTi 2 O 4 under high pressures up to 80 GPa
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Image
Relations of effective radii and structure fields of AB2O4 oxides (adapted from Glasser and Glasser 1963). The spinels magnesioferrite, chromite, magnesiochromite, and ulvospinel are indicated by half-filled diamonds. The corresponding high-pressure minerals maohokite (Chen et al. 2017), xieite (Chen et al. 2003), chenmingite (Ma et al. 2018), and tschaunerite (Ma et al. 2018) are in the post-spinal field, which at ambient pressure is occupied by phases with rA &gt;1.05 Å. It is noteworthy that the transition from spinels to post-spinel AB2O4 is not direct but through a regime of partial decomposition into sesquioxides and ludwigite-type oxides (Nishio-Hamane et al. 2012; Ishii et al. 2014, 2015; Akaogi et al. 2018).

Relations of effective radii and structure fields of AB 2 O 4 oxides (adap...

Published: 01 December 2019
Figure 5. Relations of effective radii and structure fields of AB 2 O 4 oxides (adapted from Glasser and Glasser 1963 ). The spinels magnesioferrite, chromite, magnesiochromite, and ulvospinel are indicated by half-filled diamonds. The corresponding high-pressure minerals maohokite ( Chen et al
Journal Article

Rubinite, Ca 3 Ti 2 3 + Si 3 O 12 , a new mineral in CV3 carbonaceous chondrites and a refractory garnet from the solar nebula

Chi Ma, Takashi Yoshizaki, Alexander N. Krot, John R. Beckett, Tomoki Nakamura, Kazuhide Nagashima, Jun Muto, Marina A. Ivanova, Alexander A. Ulyanov
Published: 01 March 2025
American Mineralogist (2025) 110 (3): 489–500.
DOI: https://doi.org/10.2138/am-2024-9435
... a 3 ¯ d garnet-type structure with a = 12.19(1) Å, Z = 8, and an end-member formula of Ca 3 Ti 2 3 + Si 3 O 12 . Rubinite was identified as micrometer-sized crystals in five refractory Ca,Al-rich inclusions (CAIs) from the CV3 carbonaceous chondrites Allende, Efremovka, and Vigarano. In the Vigarano...
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View PDF for article title, Rubinite, Ca 3 Ti 2 3 + Si 3 O 12 , a new mineral in CV3 carbonaceous chondrites and a refractory garnet from the solar nebula
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Journal Article

High P-T phase relations of Al-bearing magnetite: Post-spinel phases as indicators for P-T conditions of formation of natural samples

Laura Uenver-Thiele, Alan B. Woodland, Nobuyoshi Miyajima, Tiziana Boffa Ballaran, Edith Alig, Lothar Fink
Published: 01 June 2024
American Mineralogist (2024) 109 (6): 1062–1073.
DOI: https://doi.org/10.2138/am-2023-8948
... post-spinel phases have been reported in terrestrial samples, including in a shocked gneiss from the Xiuyan impact crater [CF-type structured hp-MgFe 2 O 4 , named Maohokite, IMA 2017-047 ( Chen et al. 2019 )] or as inclusions in diamond from the Juina area, Mato Grosso State, Brazil [CaTi 2 O 4 -type...
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View PDF for article title, High P-T phase relations of Al-bearing magnetite: <span class="search-highlight">Post</span>-<span class="search-highlight">spinel</span> phases as indicators for P-T conditions of formation of natural samples
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Journal Article

A wide ocean-continent transition along the south-west Australian margin: first results of the MARGAU/MD110 cruise

Marie-Odile Beslier, Jean-Yves Royer, Jacques Girardeau, Peter J. Hill, Eric Boeuf, Cameron Buchanan, Fabienne Chatin, Gilles Jacovetti, Alain Moreau, Marc Munschy, Céline Partouche, Ursula Robert, Steve Thomas
Published: 01 November 2004
Bulletin de la Société Géologique de France (2004) 175 (6): 629–641.
DOI: https://doi.org/10.2113/175.6.629
... spreading with further remobilization during the Australia-Antarctic separation, or from post-Neocomian ultra-slow seafloor spreading. Because of the omnipresence of extensive tectonic structures (fig. 3) and of the relatively small proportion of crustal rocks relative to the mantle rocks, we argue...
View PDF for article title, A wide ocean-continent transition along the south-west Australian margin: first results of the MARGAU/MD110 cruise
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Journal Article

Synthesis and recovery of bulk Fe 4 O 5 from magnetite, Fe 3 O 4 . A member of a self-similar series of structures for the lower mantle and transition zone

J. Guignard, W. A. Crichton
Published: 01 April 2014
Mineralogical Magazine (2014) 78 (2): 361–371.
DOI: https://doi.org/10.1180/minmag.2014.078.2.09
...-types, most notably from those of the spinels, post-spinels and post-perovskites. © 2014 The Mineralogical Society 2014 Fe 4 O 5 magnetite phase transition spinel Sr 2 Tl 2 O 5 structures HPHT synchrotron * E-mail: [email protected] 13 10 2013 14 1 2014...
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View PDF for article title, Synthesis and recovery of bulk Fe 4 O 5 from magnetite, Fe 3 O 4 . A member of a self-similar series of <span class="search-highlight">structures</span> for the lower mantle and transition zone
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Journal Article

High-pressure high-temperature transitions in MgCr 2 O 4 and crystal structures of new Mg 2 Cr 2 O 5 and post-spinel MgCr 2 O 4 phases with implications for ultrahigh-pressure chromitites in ophiolites

Takayuki Ishii, Hiroshi Kojitani, Kiyoshi Fujino, Hitoshi Yusa, Daisuke Mori, Yoshiyuki Inaguma, Yoshitaka Matsushita, Kazunari Yamaura, Masaki Akaogi
Published: 01 January 2015
American Mineralogist (2015) 100 (1): 59–65.
DOI: https://doi.org/10.2138/am-2015-4818
... and subsequent recombination to the post-spinel MgCr 2 O 4 phase with increasing pressure. We have analyzed structures of the Mg 2 Cr 2 O 5 and MgCr 2 O 4 phases, resulting in that the two phases have the modified ludwigite (mLd)-type and CaTi 2 O 4 (CT)-type structures, respectively. The outline of our...
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View PDF for article title, High-pressure high-temperature transitions in MgCr 2 O 4 and crystal <span class="search-highlight">structures</span> of new Mg 2 Cr 2 O 5 and <span class="search-highlight">post</span>-<span class="search-highlight">spinel</span> MgCr 2 O 4 phases with implications for ultrahigh-pressure chromitites in ophiolites
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Journal Article

Electronic state of oxygen in oxide minerals : an XAS study on the influence of cationic environment

Maria Ondina FIGUEIREDO, José MIRÃO
Published: 01 November 2002
European Journal of Mineralogy (2002) 14 (6): 1061–1067.
DOI: https://doi.org/10.1127/0935-1221/2002/0014-1061
...: rutile-type (rutile, pyrolusite and cassiterite), fluorite-type (thorianite), spinel-type (spinel s.s. ) and garnet-type (andradite). Full multiple-scattering calculations are compared to actual spectra with the aim of interpreting pre-edge peaks and post-edge features. Comments are presented on the role...
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Journal Article

Mantle Discontinuity Depths Beneath the West Philippine Basin from Receiver Function Analysis of Deep-Sea Borehole and Seafloor Broadband Waveforms

Daisuke Suetsugu, Masanao Shinohara, Eiichiro Araki, Toshihiko Kanazawa, Kiyoshi Suyehiro, Tomoaki Yamada, Kazuo Nakahigashi, Hajime Shiobara, Hiroko Sugioka, Kenji Kawai, Yoshio Fukao
Published: 01 October 2005
Bulletin of the Seismological Society of America (2005) 95 (5): 1947–1956.
DOI: https://doi.org/10.1785/0120040169
... discontinuities (called the “410” and “660,” respectively, hereafter) provides valuable data on the Earth’s thermal and compositional structure, since the 410 and 660 are interpreted to be caused by olivine- β spinel and post-spinel phase changes, respectively. In lower temperature environments, for instance...
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View PDF for article title, Mantle Discontinuity Depths Beneath the West Philippine Basin from Receiver Function Analysis of Deep-Sea Borehole and Seafloor Broadband Waveforms
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Journal Article

The chemical and mineralogical variations in the nickel mineralization associated with the Kambalda Dome, Western Australia

Paul Woolrich, A. Cowden, N. E. Giorgetta
Journal: Economic Geology
Published: 01 October 1981
Economic Geology (1981) 76 (6): 1629–1644.
DOI: https://doi.org/10.2113/gsecongeo.76.6.1629
...Paul Woolrich; A. Cowden; N. E. Giorgetta Abstract The volcanic peridotite-associated nickel deposits at Kambalda, Western Australia, consist of a number of orebodies or shoots located on the flanks of a broad domal structure within an Archean greenstone belt in the Yilgarn Block. Chemical...
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