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ulvospinel

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Journal Article
Published: 01 April 2019
Mineralogical Magazine (2019) 83 (2): 293–313.
... oxygen atoms per formula unit, and that of matyhite was shown to be trigonal, R 3 c , with a = 10.456 (7) Å, c = 37.408(34) Å, V = 3541.6 (4.8) Å 3 and Z = 6 for 28 oxygen atoms per formula unit. On the basis of their constant association with the grain-boundary assemblage: Fe sulfide + ulvöspinel + Al...
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Journal Article
Published: 01 February 2019
American Mineralogist (2019) 104 (2): 244–261.
...) titanomagnetite exsolutions into ulvöspinel + magnetite; followed by (IV) sub-solidus re-equilibration in clinopyroxenes and among Fe–Ti oxides + hercynite. Using exact phase boundary theory, pressures of lamellar exsolution within the host diopside are estimated as ~2 GPa with an error of ± ≤1 GPa. The present...
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Journal Article
Published: 01 January 2019
European Journal of Mineralogy (2019) 31 (1): 183–192.
... X 4 . The oxyspinel group (33 species) can be divided into the spinel subgroup 2-3 ( A 2 + B 2 3 + O 4 ) and the ulvöspinel subgroup 4-2 ( A 4 + B 2 2 + O 4 ) , the thiospinel group (20 species) into the carrollite subgroup 1-3.5 ( A 1 + B 2 3.5 + S 4 ) and the linnaeite subgroup 2-3 ( A 2 + B 2 3...
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Journal Article
Published: 01 February 2018
Mineralogical Magazine (2018) 82 (1): 35–58.
... clinopyroxenes; feldspars (K-feldspar, Ba-K-feldspar and Na-feldspar) and spinels (chromite-magnetite and qandilite-ulvöspinel-franklinite). These dykes have undergone diverse and significant degrees of deuteric alteration as shown by the formation of secondary phases such as: titanite, allanite, hydro-zircon...
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Journal Article
Published: 01 October 2016
Mineralogical Magazine (2016) 80 (6): 1067–1076.
..., kuratite coexisting with Al, Ti-bearing hedenbergite, ulvöspinel, iron-sulfide, tsangpoite, Ca-rich fayalite and kirschsteinite in D'Orbigny angrite most probably was formed at >1000°C by rapid cooling of an interstitial melt, which is subsilicic, almost Mg-free but enriched in Al-P-Ca-Ti-Fe. Abstract...
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Journal Article
Published: 01 May 2016
The Canadian Mineralogist (2016) 54 (3): 539–553.
... dominant exsolution phases in the Ti-rich magnetite, whereas the ulvöspinel phase is barely found. The ilmenite exsolution may have different origins: (1) the cloth-texture lamellae primarily exsolved as ulvöspinel, which was oxidized to ilmenite later at <600 °C; (2) most of the trellis- and sandwich...
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Journal Article
Published: 01 May 2016
American Mineralogist (2016) 101 (5): 1072–1083.
... St. dev.% 7.24 6.99 7.79 3.35 7.66 2.01 5.05 18.03 10.70 5.21 XRD results show a complex mixture of iron oxides (wüstite, magnetite, hematite), silicates (fayalite, forsterite, kirschsteinite, wollastonite), spinel (hercynite, ulvospinel), amorphous material and alteration...
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Journal Article
Published: 01 October 2015
American Mineralogist (2015) 100 (10): 2018–2025.
... ülvospinel contents. * E-mail: pvburger@unm.edu Manuscript handled by Don Baker 02 10 2014 20 1 2015 © 2015 Mineralogical Society of America 2015 Not only does f O 2 profoundly change the spinel-melt partitioning systematics of V, but it also exerts a significant...
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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...
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Journal Article
Published: 01 April 2014
American Mineralogist (2014) 99 (4): 847–851.
...Ferdinando Bosi; Ulf Hålenius; Henrik Skogby Abstract Five spinel single-crystal samples within the ulvöspinel-qandilite series [(Fe 2− x Mg x )TiO 4 , 0.15 < x < 0.94] were synthesized and structurally and chemically characterized by X-ray diffraction and electron microprobe techniques. Site...
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Journal Article
Published: 01 February 2014
American Mineralogist (2014) 99 (2-3): 255–260.
...G. Diego Gatta; Ferdinando Bosi; Garry J. McIntyre; Ulf Hålenius Abstract A single-crystal neutron diffraction study of a synthetic ulvöspinel sample of composition Fe 3+ 0.40 Fe 2+ 1.80 Ti 0.80 O 4 was performed to investigate the static positional disorder at the octahedrally coordinated M site...
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Journal Article
Published: 01 April 2013
Mineralogical Magazine (2013) 77 (3): 327–334.
... and ulvöspinel. Kudryavtsevaite is opaque with a vitreous lustre and shows a black streak. It is brittle; the Vickers hardness (VHN 100 ) is 901 kg mm −2 (range: 876–925) (Mohs hardness ~6). In reflected light, kudryavtsevaite is moderately bireflectant and very weakly pleochroic from dark grey to a slightly...
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Journal Article
Published: 01 August 2012
American Mineralogist (2012) 97 (8-9): 1330–1338.
...Kristina I. Lilova; Carolyn I. Pearce; Christopher Gorski; Kevin M. Rosso; Alexandra Navrotsky Abstract The thermodynamics of mixing and its dependence on cation distribution in the Fe 3 O 4 –Fe 2 TiO 4 (magnetite-ulvöspinel) spinel solid solution were studied using high-temperature oxide melt...
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Journal Article
Published: 01 August 2011
American Mineralogist (2011) 96 (8-9): 1193–1198.
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Journal Article
Published: 01 January 2011
American Mineralogist (2011) 96 (1): 100–110.
... is buffered by the nepheline-albite equilibrium. In these situations, AUNIlF is stable at oxygen fugacities ≥ −1.15 (ΔFMQ). At values below a SiO 2 / a Fa ~0.77, the AUNIlF equilibrium is shifted to lower oxygen fugacities and ilmenite becomes unstable relative to ulvøspinel. Analogous to the construction...
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Journal Article
Published: 01 April 2010
American Mineralogist (2010) 95 (4): 425–439.
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Journal Article
Journal: Elements
Published: 01 August 2009
Elements (2009) 5 (4): 209–215.
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Journal Article
Published: 01 January 2009
American Mineralogist (2009) 94 (1): 181–189.
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Journal Article
Published: 01 August 2008
American Mineralogist (2008) 93 (8-9): 1312–1316.
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Journal Article
Published: 01 August 2008
American Mineralogist (2008) 93 (8-9): 1437–1448.
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