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Journal Article
Published: 01 June 2022
American Mineralogist (2022) 107 (6): 1018–1029.
...Lixin Gu; Sen Hu; Mahesh Anand; Xu Tang; Jianglong Ji; Bin Zhang; Nian Wang; Yangting Lin Abstract We report on the discovery of two high-pressure minerals, tuite and ahrensite, located in two small shock-induced melt pockets (SIMP 1 and 2) in the Zagami martian meteorite, coexisting with granular...
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Journal Article
Published: 01 October 2016
American Mineralogist (2016) 101 (10): 2347–2350.
... analyses of the crystallography and phase compositions of these olivines were conducted to evaluate the postulate that the Qtz rods formed during inversion of super-silicic ahrensite to Fa+Qtz during decompression. These new observations show the Qtz rods consistently occur in crystallographically coherent...
FIGURES
Image
( a ) HAADF image of foil sample of melt pocket 2 (foil 2), which contains ...
Published: 01 June 2022
Figure 8. ( a ) HAADF image of foil sample of melt pocket 2 (foil 2), which contains ahrensite, tuite, and the associated matrix. ( b ) Ca element distribution mapping shows that the exsolution lamellae in pigeonite are Ca-rich. ( c ) TEM image of the fine-grained mineral assemblage. Average
Image
Symmetric mixing relation in the ringwoodite-<span class="search-highlight">ahrensite</span> binary system. Synth...
Published: 01 December 2019
Figure 8. Symmetric mixing relation in the ringwoodite-ahrensite binary system. Synthetic samples by Ito and Takahashi (1989) , Hazen et al. (1992), and Akimoto and Fujisawa 1968 . Type ahrensite is the data point with 56 mol% ahrensite.
Image
P-T  constraints revealed by the formation of tuite, <span class="search-highlight">ahrensite</span>, and stishov...
Published: 01 June 2022
Figure 9. P-T constraints revealed by the formation of tuite, ahrensite, and stishovite in Zagami meteorite. Black line is the phase diagram of MgSiO 3 ( Gasparik 1990 ). Blue lines show the stability fields of F- and OH-apatite ( Murayama et al. 1986 ). Orange dashed line is the boundary
Image
BSE image of shock induced melt pocket 2 (SIMP 2) outlined by white dashed ...
Published: 01 June 2022
of SIMP 2. A pigeonite grain outlined by a white rectangle in melt pocket 2 displays Ca-rich exsolution lamellae, similar to the texture of host pyroxene. However, Raman analysis indicates that this grain has been transformed into ringwoodite/ahrensite. Px = pyroxene; Sti = stishovite. Ahr = ahrensite.
Image
Fe 2 SiO 4  spinel (ringwoodite <span class="search-highlight">ahrensite</span>) and high-pressure phase  I -Fe 2...
Published: 01 August 2015
Figure 9 Fe 2 SiO 4 spinel (ringwoodite ahrensite) and high-pressure phase I -Fe 2 SiO 4 are presented in the left and right figure, respectively. Arrow indicates a martensitic transformation with translation vector < 1 / 8 →   1 / 8 →   1 / 8
Image
Raman spectra of various phases marked in  Figure 6 . ( a ) pigeonite (R28)...
Published: 01 June 2022
Figure 7. Raman spectra of various phases marked in Figure 6 . ( a ) pigeonite (R28), ( b ) augite (R27), ( c ) ahrensite (R24), ( d ) tuite (R23), and ( e ) stishovite (R22).
Journal Article
Published: 01 July 2014
American Mineralogist (2014) 99 (7): 1315–1334.
... therefore speculate these quartz needles may be silica that exsolved from Mn-rich ahrensite, the Fe analog of ringwoodite, upon decompression and inversion to fayalite. If correct, this occurrence would be the first reported sample of naturally occurring olivine (fayalite) that inverted from ahrensite...
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Journal Article
Published: 01 November 2015
American Mineralogist (2015) 100 (11-12): 2412–2418.
..., a CV3 carbonaceous chondrite. The presence of icosahedrite associated with high-pressure phases like ahrensite and stishovite indicates formation at high pressures and temperatures due to an impact-induced shock. Previous experimental studies on the stability of synthetic icosahedral AlCuFe have either...
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Journal Article
Published: 01 October 2015
American Mineralogist (2015) 100 (10): 2340–2343.
... of a heterogeneous distribution of pressures and temperatures that occurred during impact shock, in which some portions of the meteorite reached at least 5 GPa and 1200 °C. Decagonite is associated with Al-bearing trevorite, diopside, forsterite, ahrensite, clinoenstatite, nepheline, coesite, pentlandite, Cu-bearing...
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Journal Article
Published: 01 November 2014
American Mineralogist (2014) 99 (11-12): 2433–2436.
.... The meteorite fragments contain the high-pressure phases ahrensite, coesite, stishovite, and an unnamed spinelloid with composition Fe 3– x Si x O 4 ( x ≈ 0.4). Other minerals include trevorite, Ni-Al-Mg-Fe spinels, magnetite, diopside, forsterite, clinoenstatite, nepheline, pentlandite, Cu-bearing troilite...
FIGURES
Journal Article
Published: 01 July 2014
American Mineralogist (2014) 99 (7): 1254–1264.
... have been approved: ahrensite, brunogeierite, chromite, cochromite, coulsonite, cuprospinel, filipstadite, franklinite, gahnite, galaxite, hercynite, jacobsite, magnesiochromite, magnesiocoulsonite, magnesioferrite, magnetite, manganochromite, qandilite, ringwoodite, spinel, trevorite, ülvospinel...
FIGURES
Image
Bridgmanite-wuestite intergrowth at the border of a shock-melt pocket in th...
Published: 01 December 2019
corner with idiomorphic wuestite. The much finer-grained material in the upper left corner of the image is ahrensite (γ-Fe 2 SiO 4 ). (Color online.)
Journal Article
Published: 01 October 2018
American Mineralogist (2018) 103 (10): 1521–1522.
..., shergottites, and one eucrite), including bridgmanite (MgSiO 3 -perovskite, the most abundant mineral in Earth; Tschauner et al. 2014 ), ahrensite (Fe 2 SiO 4 -spinel; Ma et al. 2016 ), tissintite [(Ca,Na,□)AlSi 2 O 6 -clinopyroxene; Ma et al. 2015], liebermannite (KAlSi 3 O 8 -hollandite; Ma et al. 2018...
Journal Article
Published: 01 October 2018
American Mineralogist (2018) 103 (10): 1599–1603.
... and Isshiki 1998 ). The olivine/spinel transition is a well-known feature of the mantle ( Hart 1969 ; Ringwood 1970 ). It includes the two transitions at the Mg-rich end (forsterite to wadsleyite and wadsleyite to ringwoodite) and the one transition at the Fe-rich end (fayalite to ahrensite). The surface...
FIGURES
Journal Article
Published: 01 October 2019
American Mineralogist (2019) 104 (10): 1521–1525.
...-generated melt pockets and veins in this meteorite, olivine is often transformed to ringwoodite or ahrensite and, in the immediate vicinity of the melt veins or pockets, to bridgmanite plus wüstite ( Ma et al. 2016 ). Plagioclase is transformed to maskelynite, locally melted and partially crystallized...
FIGURES
Journal Article
Published: 01 May 2019
American Mineralogist (2019) 104 (5): 775–778.
... ), ringwoodite-ahrensite ( Binns et al. 1969 ; Ma et al. 2016 ; Bindi et al. 2018 ), and bridgmanite ( Tschauner et al. 2014 ) have been discovered in extraterrestrial rocks that have experienced high-pressure and high-temperature collisions in outer space. Such rocks, known as shocked meteorites, represent...
FIGURES
Journal Article
Published: 01 December 2019
American Mineralogist (2019) 104 (12): 1701–1731.
...Figure 8. Symmetric mixing relation in the ringwoodite-ahrensite binary system. Synthetic samples by Ito and Takahashi (1989) , Hazen et al. (1992), and Akimoto and Fujisawa 1968 . Type ahrensite is the data point with 56 mol% ahrensite. ...
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Journal Article
Published: 01 February 2016
American Mineralogist (2016) 101 (2): 483–486.
... are not expected to exhibit high solubility in Mg 2 SiO 4 ringwoodite in the spinel structure. Ringwoodite-ahrensite (Mg 2 SiO 4 -Fe 2 SiO 4 ) solid solution is the major rock-forming mineral in peridotitic lithologies in the deep transition zone. Ringwoodite can incorporate a considerable amount of hydrogen...
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