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akimotoite

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Journal Article

The influence of Al 2 O 3 on the structural properties of MgSiO 3 akimotoite

Nicki C. Siersch, Giacomo Criniti, Alexander Kurnosov, Tiziana Boffa Ballaran, Zhaodong Liu, Takayuki Ishii, Daniel J. Frost, Tony Yu, Yanbin Wang
Published: 03 January 2023
American Mineralogist (2023) 108 (1): 100–109.
DOI: https://doi.org/10.2138/am-2022-8257
...Nicki C. Siersch; Giacomo Criniti; Alexander Kurnosov; Tiziana Boffa Ballaran; Zhaodong Liu; Takayuki Ishii; Daniel J. Frost; Tony Yu; Yanbin Wang Abstract Akimotoite, a MgSiO 3 polymorph present in the lower transition zone within ultramafic portions of subducting slabs and potentially also...
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Shock-induced P-T conditions and formation mechanism of akimotoite-pyroxene glass assemblages in the Grove Mountains (GRV) 052082 (L6) meteorite

Lu Feng, Masaaki Miyahara, Toshiro Nagase, Eiji Ohtani, Sen Hu, Ahmed El Goresy, Yangting Lin
Published: 01 June 2017
American Mineralogist (2017) 102 (6): 1254–1262.
DOI: https://doi.org/10.2138/am-2017-5905
...Lu Feng; Masaaki Miyahara; Toshiro Nagase; Eiji Ohtani; Sen Hu; Ahmed El Goresy; Yangting Lin Abstract Akimotoite [(Mg,Fe)SiO 3 -ilmenite] was encountered in shock-induced melt veins of Grove Mountains (GRV) 052082, a highly equilibrated low iron ordinary chondritic meteorite (L6). Coexistence...
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The equations of state of forsterite, wadsleyite, ringwoodite, akimotoite, MgSiO 3 -perovskite, and postperovskite and phase diagram for the Mg 2 SiO 4 system at pressures of up to 130 GPa

P.I. Dorogokupets, A.M. Dymshits, T.S. Sokolova, B.S. Danilov, K.D. Litasov
Published: 01 January 2015
Russ. Geol. Geophys. (2015) 56 (1-2): 172–189.
DOI: https://doi.org/10.1016/j.rgg.2015.01.011
...P.I. Dorogokupets; A.M. Dymshits; T.S. Sokolova; B.S. Danilov; K.D. Litasov Abstract The equations of state of forsterite, wadsleyite, ringwoodite, MgSiO 3 -perovskite, akimotoite, and postperovskite are set up by joint analysis of experimentally measured isobaric heat capacity, bulk moduli...
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Comparative Raman spectroscopic study on ilmenite-type MgSiO 3 (akimotoite), MgGeO 3 , and MgTiO 3 (geikielite) at high temperatures and high pressures

Taku Okada, Toshiharu Narita, Takaya Nagai, Takamitsu Yamanaka
Published: 01 January 2008
American Mineralogist (2008) 93 (1): 39–47.
DOI: https://doi.org/10.2138/am.2008.2490
...–24 GPa below the 2300 K range ( Sawamoto 1987 ), and thus is considered a candidate component at 600–700 km depths in subducting slabs. (Mg,Fe) SiO 3 -ilmenite was found in the shock vein of meteorite and named akimotoite ( Tomioka and Fujino 1997 ). MgGeO 3 shows the same polymorphic transitions...
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Ferric iron in Al-bearing akimotoite coexisting with iron-nickel metal in a shock-melt vein in an L-6 chondrite

Nobuyoshi Miyajima, Ahmed El Goresy, Catherine Dupas-Bruzek, Friedrich Seifert, David C. Rubie, Ming Chen, Xiande Xie
Published: 01 October 2007
American Mineralogist (2007) 92 (10): 1545–1549.
DOI: https://doi.org/10.2138/am.2007.2546
...Nobuyoshi Miyajima; Ahmed El Goresy; Catherine Dupas-Bruzek; Friedrich Seifert; David C. Rubie; Ming Chen; Xiande Xie Abstract We report evidence for high ferric iron to total iron (Fe 3+ /∑Fe) ratios in Al-bearing akimotoite coexisting with other high-pressure silicates and Fe-Ni metal from shock...
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Hydroxyl in MgSiO 3 akimotoite: A polarized and high-pressure IR study

Nathalie Bolfan-Casanova, Hans Keppler, David C. Rubie
Published: 01 May 2002
American Mineralogist (2002) 87 (5-6): 603–608.
DOI: https://doi.org/10.2138/am-2002-5-602
...Nathalie Bolfan-Casanova; Hans Keppler; David C. Rubie Abstract Hydrous MgSiO 3 akimotoite (ilmenite-type structure), containing 350 ppm wt H 2 O as hydroxyl, was synthesized at 19 GPa and 1300 °C in a multi-anvil apparatus. Polarized Fourier-transform infrared spectra show bands at 3300 and 3320...
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Akimotoite, (Mg,Fe)SiO 3 , a new silicate mineral of the ilmenite group in the Tenham chondrite

Naotaka Tomioka, Kiyoshi Fujino
Published: 01 March 1999
American Mineralogist (1999) 84 (3): 267–271.
DOI: https://doi.org/10.2138/am-1999-0307
...Naotaka Tomioka; Kiyoshi Fujino Abstract Akimotoite, (Mg,Fe)SiO 3 , a new silicate mineral of the ilmenite group, was found in the shock-metamorphosed Tenham chondrite. It occurs as aggregates adjacent to clinoenstatite in fragments within shock-induced melt veins. Chemical analyses show...
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Variation of FeO and MgO concentrations in <span class="search-highlight">akimotoite</span> (Aki) and pyroxene me...

Variation of FeO and MgO concentrations in akimotoite (Aki) and pyroxene me...

Published: 01 June 2017
Figure 7. Variation of FeO and MgO concentrations in akimotoite (Aki) and pyroxene melt (Px melt) vs. fraction of melt remaining based on Equation 1 . Solid lines are calculated curves of pyroxene melt and dashed lines are of akimotoite. Dark and light gray areas are compositional ranges
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BSE images of pyroxene clasts in the shock-induced vein from GRV 052082. ( ...

BSE images of pyroxene clasts in the shock-induced vein from GRV 052082. ( ...

Published: 01 June 2017
) and the dark akimotoite grains (Fs 17.3 ). ( c ) High-pressure mineral assemblages in the shock-induced vein. Red box locates image d . ( d ) High-magnification image of bright pyroxene glass area (Fs 21.4 ) and dark akimotoite crystals (Fs 15.5 ). Note the elongation of akimotoite and metal (white needles
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Optical (Reflectance) microscopic photograph of the fragment <span class="search-highlight">akimotoite</span> + l...

Optical (Reflectance) microscopic photograph of the fragment akimotoite + l...

Published: 01 November 2006
Fig. 6. Optical (Reflectance) microscopic photograph of the fragment akimotoite + low-Ca pyroxene. Ak: akimotoite; Pyx: pyroxene.
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27 Al MAS-NMR spectra (18.8 T) of <span class="search-highlight">akimotoite</span>&#x2F;majorite sample 1B. Peaks repr...

27 Al MAS-NMR spectra (18.8 T) of akimotoite/majorite sample 1B. Peaks repr...

Published: 01 November 2012
Figure 5 27 Al MAS-NMR spectra (18.8 T) of akimotoite/majorite sample 1B. Peaks representing corundum at 15 ppm and octahedral Al in either akimotoite or majorite are labeled.
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Octahedral volumes of MgO 6 , SiO 6 , and AlO 6 as a function of Al 2 O 3 ...

Octahedral volumes of MgO 6 , SiO 6 , and AlO 6 as a function of Al 2 O 3 ...

Published: 03 January 2023
Figure 2. Octahedral volumes of MgO 6 , SiO 6 , and AlO 6 as a function of Al 2 O 3 content in the akimotoite structure. The MgO 6 and SiO 6 octahedral volumes decrease and increase, respectively, as Al is substituted into the structure. The variation of the octahedral volumes MgO 6 and SiO
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( a ) Bright-field TEM (BF-TEM) image of FIB slice from Aki-Px Glass assemb...

( a ) Bright-field TEM (BF-TEM) image of FIB slice from Aki-Px Glass assemb...

Published: 01 June 2017
Figure 4. ( a ) Bright-field TEM (BF-TEM) image of FIB slice from Aki-Px Glass assemblage. Idiomorphic crystals of akimotoite (Aki) embedded in amorphous pyroxene glass (Px-Glass). ( b ) SAED pattern of an akimotoite crystallite along the zonal axis [ 3 00].
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A back-scattered electron image of a shock-induced melt vein containing a p...

A back-scattered electron image of a shock-induced melt vein containing a p...

Published: 01 November 2006
Fig. 4. A back-scattered electron image of a shock-induced melt vein containing a polymineralic fragment. The fragment is composed of diopside, pyroxene, akimotoite, and ringwoodite, which are in triple-junction contact. Ol: olivine; Ri: ringwoodite; Di: diopside; Pyx: pyroxene; Ak: akimotoite
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MF-XRD patterns of <span class="search-highlight">akimotoite</span> (bottom) with the pyrope composition (py-Ak) ...

MF-XRD patterns of akimotoite (bottom) with the pyrope composition (py-Ak) ...

Published: 01 September 2017
Figure 1. MF-XRD patterns of akimotoite (bottom) with the pyrope composition (py-Ak) synthesized at 27 GPa and 1170 K and LiNbO 3 -type phase (top) also with the pyrope composition (py-LN) obtained from recovering a sample from 2000 K and 45 GPa.
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Plots of FeO- and MgO-contents of <span class="search-highlight">akimotoite</span>, pyroxene in host rock, and py...

Plots of FeO- and MgO-contents of akimotoite, pyroxene in host rock, and py...

Published: 01 June 2017
Figure 6. Plots of FeO- and MgO-contents of akimotoite, pyroxene in host rock, and pyroxene glass. (Color online.)
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Typical conventional TEM images of the edge of the melt vein, showing ( a )...

Typical conventional TEM images of the edge of the melt vein, showing ( a )...

Published: 01 October 2007
F igure 2. Typical conventional TEM images of the edge of the melt vein, showing ( a ) the complex mineral assemblage and ( b ) the morphology of plate-like akimotoite crystals elongated parallel to the (110) direction with a selected electron diffraction pattern (inset). Akm = akimotoite, Rw
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Fe- L 2,3 ELNES of coexisting high pressure phases: ( a ) <span class="search-highlight">akimotoite</span>, ( ...

Fe- L 2,3 ELNES of coexisting high pressure phases: ( a ) akimotoite, ( ...

Published: 01 October 2007
F igure 5. Fe- L 2,3 ELNES of coexisting high pressure phases: ( a ) akimotoite, ( b ) ringwoodite, and ( c ) majoritic garnet. Note: The energy gap between Fe 2+ and Fe 3+ L 3 white-line maxima decreases from approximately 2.7 to 1.7 eV with increasing Fe 3+ , consistent
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The structure of <span class="search-highlight">akimotoite</span> (ilmenite-type MgSiO 3 ) is trigonal R 3̅ and ...

The structure of akimotoite (ilmenite-type MgSiO 3 ) is trigonal R 3̅ and ...

Published: 01 January 2006
Figure 26. The structure of akimotoite (ilmenite-type MgSiO 3 ) is trigonal R 3̅ and closely related to that of corundum.
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Polarized infrared spectra of MgSiO 3 <span class="search-highlight">akimotoite</span> containing about 350 ppm ...

Polarized infrared spectra of MgSiO 3 akimotoite containing about 350 ppm ...

Published: 01 January 2006
Figure 17. Polarized infrared spectra of MgSiO 3 akimotoite containing about 350 ppm of water. From Bolfan-Casanova et al. (2002) .