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schreyerite

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Journal Article
Published: 01 January 2006
American Mineralogist (2006) 91 (1): 196–202.
...Nicola Döbelin; Leonid Z. Reznitsky; Evgeny V. Sklyarov; Thomas Armbruster; Olaf Medenbach Abstract A new occurrence of schreyerite, V 2 Ti 3 O 9 , has recently been found in metamorphic rocks of the Sludyanka complex at the southern shore of Lake Baikal, Russia. In contrast to previously known...
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Journal Article
Published: 01 December 1978
American Mineralogist (1978) 63 (11-12): 1182–1186.
...O. Medenbach; K. Schmetzer Abstract Schreyerite, a new vanadium titanium oxide with the composition (V 0.93 Cr 0.06 Al 0.01 ) 2 Ti 3 O 9 giving idealized V 2 Ti 3 O 9 , is described from the K wale District, south of Voi, Kenya. The ore mineral occurs as exsolution lamellae and particles in rutile...
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A backscattered electron image of thin section UT134 where UK1 is shown replacing schreyerite. Symbols: “UK1” – unknown 1; “Shy” – schreyerite; Py – pyrite. Scale bar indicates 10 μm.
Published: 30 May 2018
Fig. 4. A backscattered electron image of thin section UT134 where UK1 is shown replacing schreyerite. Symbols: “UK1” – unknown 1; “Shy” – schreyerite; Py – pyrite. Scale bar indicates 10 μm.
Image
A backscattered electron image of thin section UT117 showing schreyerite exsolving from vanadium-bearing rutile. Symbols: Rt – V-bearing rutile; “Shy” – schreyerite; Gr – graphite. Scale bar indicates 10 μm.
Published: 30 May 2018
Fig. 3. A backscattered electron image of thin section UT117 showing schreyerite exsolving from vanadium-bearing rutile. Symbols: Rt – V-bearing rutile; “Shy” – schreyerite; Gr – graphite. Scale bar indicates 10 μm.
Image
A polyhedral representation of the schreyerite structure projected approximately along [010]. Two types of chains can be distinguished: the dark polyhedra form berdesinskiite-type (V3O5-type) chains of edge-shearing octahedra, whereas the light polyhedra form α-PbO2-type chains of edge-sharing octahedra. The chains are interconnected to staircase-like layers (P and Q slabs). Different stacking sequences of P and Q slabs are possible. Schreyerite shows maximum alternation, also expressed as P1Q1.
Published: 01 January 2006
F igure 2. A polyhedral representation of the schreyerite structure projected approximately along [010]. Two types of chains can be distinguished: the dark polyhedra form berdesinskiite-type (V 3 O 5 -type) chains of edge-shearing octahedra, whereas the light polyhedra form α-PbO 2 -type chains
Journal Article
Published: 01 February 2020
American Mineralogist (2020) 105 (2): 239–243.
... 0.10 Ti 0.08 4 + Fe 0.06 Ca 0.03 Mg 0.01 )( Ti 2.71 4 + Zr 0.28 Si 0.01 )O 9 . The general formula is (Al,Sc) 2 (Ti 4+ ,Zr) 3 O 9 . The end-member formula is Al 2 Ti 3 O 9 . Machiite has the C 2 /c schreyerite-type structure with a = 17.10 Å, b = 5.03 Å, c = 7.06 Å, β = 107°, V = 581 Å 3 , and Z = 4...
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Published: 30 May 2018
TABLE 4. A COMPARISON OF THE AVERAGE COMPOSITIONS, DETERMINED BY EMPA, OF SCHREYERITE FROM GREEN GIANT (THIS STUDY)
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Morphology of niobian rutile microinclusions in schreyerite (a), berdesinskiite (b, c) and titanite (d). SEM image.
Published: 01 December 2016
Fig. 3. Morphology of niobian rutile microinclusions in schreyerite ( a ), berdesinskiite ( b , c ) and titanite ( d ). SEM image.
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Scanning electron-microscopic image of schreyerite crystal studied by single-crystal X-ray diffraction. The width of the picture is 0.14 mm.
Published: 01 January 2006
F igure 1. Scanning electron-microscopic image of schreyerite crystal studied by single-crystal X-ray diffraction. The width of the picture is 0.14 mm.
Image
The schreyerite structure shown as a closest oxygen-packing representation projected normal to (010) (top) and (201) (bottom). The large light spheres represent oxygen atoms and the small dark spheres represent octahedrally coordinated cations. Three different monoclinic unit cells are shown: (1) the unit cell presented in this study, (2) the unit cell reported by Grey et al. (1973), and (3) the unit cell reported by Grey and Reid (1972). Axis labels and indices apply to unit cell 1.
Published: 01 January 2006
F igure 3. The schreyerite structure shown as a closest oxygen-packing representation projected normal to (010) ( top ) and (201) ( bottom ). The large light spheres represent oxygen atoms and the small dark spheres represent octahedrally coordinated cations. Three different monoclinic unit
Journal Article
Published: 30 May 2018
The Canadian Mineralogist (2018) 56 (3): 247–257.
...Fig. 4. A backscattered electron image of thin section UT134 where UK1 is shown replacing schreyerite. Symbols: “UK1” – unknown 1; “Shy” – schreyerite; Py – pyrite. Scale bar indicates 10 μm. ...
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Journal Article
Published: 01 February 2013
Mineralogical Magazine (2013) 77 (1): 33–44.
... . In the metamorphic rocks of the Sludyanka complex, vanadium can be present as V 4+ and V 3+ within the same mineral (e.g. in batisivite, schreyerite and berdesinskiite). Kyzylkumite has a flexible composition with respect to the M 4+ /M 3+ ratio. The relationship between kyzylkumite and a closely related Be-bearing...
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Journal Article
Published: 01 September 2018
American Mineralogist (2018) 103 (9): 1502–1511.
..., ilmenite, and Al-Ti-rich pyroxene in shock melt pockets. It has an empirical chemical formula of ( Ti 0.73 4 + Fe 0.63 2 + Al 0.60 Mn 0.03 Mg 0.02 Cr 0.01 ) Ti 3 4 + O 9 and the monoclinic C 2/ c structure of schreyerite. The ideal vestaite structure can be considered as a modular structure...
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Series: Reviews in Economic Geology
Published: 01 January 2016
DOI: 10.5382/Rev.18.09
EISBN: 9781629490922
..., schreyerite, and an unnamed vanadium silicate. A few alkaline intrusive complexes that contain anomalous concentrations of gold or were prospected for gold in the past are also host to REE occurrences.The best examples are the Bear Lodge Mountains in Wyoming and Cu-REE-F (±Ag, Au) vein deposits...
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Journal Article
Published: 01 October 2008
European Journal of Mineralogy (2008) 20 (5): 975–981.
..., Siberia, Russia. The Pereval marble quarry is the type locality for natalyite, florensovite, kalininite, magnesiocoulsonite, chromphyllite and vanadiumdravite. Associated minerals are: quartz, Cr-V-bearing diopside and tremolite, calcite, schreyerite, berdesinskiite, ankangite, V-bearing titanite...
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Journal Article
Published: 01 April 1977
American Mineralogist (1977) 62 (3-4): 395–397.
...M. Fleischer; J. Jambor Abstract O. Medenbach and K. Schmetzer (1976) Schreyerite (V 2 Ti 3 O 9 ), ein neues Vanadium Mineral aus Kenya. Naturwissenschaften 63, 293-294. Copyright © 1977 by the Mineralogical Society of America 1977 ...
Journal Article
Published: 01 August 2009
European Journal of Mineralogy (2009) 21 (4): 885–891.
... . Bernhardt , H.-J. , Schmetzer , K. , Medenbach , O. ( 1983 ): Berdesinskiite, V 2 TiO 5 , a new mineral from Kenya and additional data for schreyerite, V 2 Ti 3 O 9 . N. Jb. Mineral. Mh ., 1983 , 110 – 118 . Döbelin , N. , Reznitsky , L.Z. , Sklyarov , E.V. , Armbruster...
FIGURES
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(a) Construction scheme of the octahedral framework of derbylite-hemolite group minerals assembled of α-PbO2-type zigzag double-chains (cross-hatched) and V3O5-type columns of edge-sharing MO6 octahedra (white). Unit cell directions conform to the triclinic cell of batisivite. (b) Polyhedral model of schreyerite (Döbelin et al., 2006) projected parallel to the b-axis. The structure is interpreted as a 1:1 polysome composed of berdesinskiite- type (V3O5-type) chains (white octahedra) and α-PbO2-type chains (cross-hatched octahedra).
Published: 01 October 2008
) Polyhedral model of schreyerite ( Döbelin et al. , 2006 ) projected parallel to the b -axis. The structure is interpreted as a 1:1 polysome composed of berdesinskiite- type (V 3 O 5 -type) chains (white octahedra) and α-PbO 2 -type chains (cross-hatched octahedra).
Journal Article
Published: 01 October 2018
American Mineralogist (2018) 103 (10): 1521–1522.
... 856 shergottite Tschauner and Ma 2017b) IMA 2017-068 vestaite ( Ti 4 + Fe 2 + ) Ti 3 4 + O 9 C 2/ c , schreyerite-type NWA 8003 eucrite Pang et al. (2018) * E-mail: [email protected] Vesta, the second largest object...
Journal Article
Published: 01 February 2004
Journal of Paleontology (2004) 78 (2): 414–419.
.... The Leidapo Member is equivalent to the lower upper Anisian, and the Leidapo/Bangtoupo section is situated approximately at the transition from the Schreyerites binodosus ( Hauer, 1851 ) to the Paraceratites trinodosus ( Mojsisovics, 1882 ) Zone, i.e., at the transition from the Pelsonian to the Illyrian...
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