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octahedra

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Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 629-636.
... of kenngottite was solved using single-crystal X-ray diffraction data and refined to wR obs = 0.088 for 350 reflections with I > 2σ( I ). The structure contains trimeric clusters of face-shared octahedra (Mn–Fe–Mn) that are connected into chains along [001] by sharing edges with Mn-centred octahedra...
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Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 465-471.
... of both minerals comprise heteropolyhedral slabs of composition [ XM 1 Fe 2 3 + (OH) 2 (PO 4 ) 4 ], that are linked together via corner-sharing of PO 4 tetrahedra with isolated [ M 2(O p ) 2 (H 2 O) 4 ] octahedra. The structures differ in the mode of linkage of the M 2 octahedra, which is via trans O p...
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Journal Article
Published: 01 January 2019
European Journal of Mineralogy (2019) 31 (1): 159-166.
... 0.12 Zn 0.02 ) Σ3.08 (As 3.95 P 0.07 ) Σ4.02 O 16 , and the idealised formula is Na 2 KAl 3 (AsO 4 ) 4 . Ozerovaite is orthorhombic: Cmca , a = 10.615(2), b = 20.937(3), c = 6.393(1) Å, V = 1420.9(3) Å 3 , Z = 4. The crystal structure ( R 1 = 0.031) is constructed of AlO 6 octahedra and AsO 4...
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Journal Article
Published: 01 September 2018
The Canadian Mineralogist (2018) 56 (5): 811-820.
... of alternating Cu 2+ O 4 (OH) 2 and Te 6+ O 4 (OH) 2 octahedra. The chains link to one another via shared octahedral corners to form [Cu 2+ Te 6+ O 4 (OH) 2 ] 2– sheets. Interlayer Mg(H 2 O) 6 octahedra link the sheets via hydrogen bonds. Abstract Pararaisaite, Cu 2+ Mg[Te 6+ O 4 (OH) 2 ]·6H 2 O, is a new...
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Journal Article
Published: 01 July 2018
European Journal of Mineralogy (2018) 30 (4): 801-809.
.... Its crystal structure was solved from single-crystal XRD data ( R = 0.0358). The TiO 6 octahedra are interconnected via O vertices to form infinite (Ti–O) ∝ chains. The remaining vertices of each TiO 6 octahedron are shared with SO 4 tetrahedra thus forming one-dimensional [TiO(SO 4 ) 2 ] units...
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Journal Article
Published: 01 May 2018
European Journal of Mineralogy (2018) 30 (3): 581-592.
.... The crystal structure has been solved and refined to R 1 = 0.067 on the basis of 6188 reflections with F o > 4σ( F o ) and 363 refined parameters. Marcobaldiite is a new N = 3.5 homologue of the jordanite homologous series, characterized by the 1:1 alternation of two kinds of layers of distorted octahedra...
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Journal Article
Published: 01 April 2018
Mineralogical Magazine (2018) 82 (2): 291-299.
...) 4900(90) 110(30) * Site occupations for Hagendorf Süd strunzite: Ow7, Ow4A = 0.66(7), Ow4B = 0.34(7) A polyhedral representation of the structure for ferrostrunzite, with all H atoms shown, is given in Fig. 1 . Corner-connected Fe1- and Fe2-centred octahedra form 7.3 Å chains along...
FIGURES
Journal Article
Published: 01 October 2017
American Mineralogist (2017) 102 (10): 2136-2141.
...) corresponding to the spinel module with an additional O layer (AlO 6 octahedra layer), and the module B (T2-O′-T2) showing the simplified formula CaSnAl(BeO 4 )(BO 3 ), where SnO 6 octahedra are isolated in the T2 layers, connected via BeO 4 and CaO 11 groups, and AlO 6 edge-sharing octahedra in the O′ layer...
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Journal Article
Published: 01 December 2016
European Journal of Mineralogy (2016) 28 (5): 953-958.
... located by difference Fourier methods and refined from X-ray diffraction data. The structure can be formally described by octahedral–tetrahedral “sheets” of corner-sharing [NaO 4 (H 2 O) 2 ] octahedra and (SO 4 ) tetrahedra, which constitute a structural sheet with composition [Na(SO 4 ) 2 (H 2 O) 2 ] 3...
FIGURES
Journal Article
Published: 01 November 2016
European Journal of Mineralogy (2016) 28 (4): 777-788.
... octahedra are smaller than M 1, M 2, M 11, M 12, thus Oc sheets in both layers are meso-octahedral . In even layers, however, the M 2 octahedron is somewhat smaller than M 1, so the Oc sheet is “transitional” to a hetero-octahedral character. The occupancies of Si:Fe in T positions were refined to: T 1...
FIGURES
Journal Article
Published: 01 March 2016
European Journal of Mineralogy (2016) 28 (1): 63-70.
... % (with GOF = 6.39) for 1139 observed reflections with [ I obs > 3σ( I )]. The structure of the dehydration product of kaňkite consists of corrugated heteropolyhedral sheets. Pairs of Feϕ 6 octahedra, flanked by five adjacent arsenate tetrahedra, could be seen as the building units of the corrugated sheets...
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Journal Article
Published: 17 November 2015
The Canadian Mineralogist (2015) 53 (3): 571-590.
...-lengths bond-valence There are two different octahedra in the tourmaline structure: Z O 6 and Y O 6 . The Z O 6 octahedron is smaller and more distorted than the Y O 6 octahedron ( Henry & Dutrow 1996) . It is connected to the T (3×), Y (2×), and B (2×) sites ( Fig. 1 ; Ertl et al...
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Journal Article
Published: 01 April 2015
Mineralogical Magazine (2015) 79 (2): 309-319.
... ), is essentially a sheet structure, based on the sheet motif shown in Fig. 3 . The sheets are parallel to (0 1 0) and comprise butlerite-like ( Fanfani and Zanazzi, 1971 ) 7 Å kinked chains of trans -corner-connected octahedra parallel to the c axis, decorated with corner-connected PO 4 tetrahedra. Two types...
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Journal Article
Published: 01 February 2015
American Mineralogist (2015) 100 (2-3): 608-614.
...-symmetric octahedral sites. Vanadium forms very distorted octahedra with a [2+2+2] geometry characteristic of the valence state +5. The Li,V composition of the octahedral sheet, the pure tetrasilicic character of the tetrahedral sheet, and the anhydrous character produce unusual geometrical features...
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Journal Article
Published: 17 December 2014
The Canadian Mineralogist (2014) 52 (4): 687-698.
... with shared edges forming chains parallel to the b -axis, like the [CuØ 6 ] tetragonal dipyramids. These chains are cross-linked by edge-sharing [SbO 6 ] octahedra and decorated with [SO 4 ] groups. The H atoms are in ‘holes’ within both layers. §   Corresponding author e-mail address : jgrice@mus...
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Journal Article
Published: 01 July 2014
American Mineralogist (2014) 99 (7): 1507-1510.
...) octahedra sharing edges to form zigzag chains running parallel to [010]. These octahedral chains are linked together by seven-coordinated Pb 2+ cations. In addition, a refinement of the regular raspite structure with measured chemistry Pb 1.00 W 1.00 O 4 , P 2 1 /a symmetry, and unit-cell parameters...
FIGURES
Journal Article
Published: 01 June 2014
Mineralogical Magazine (2014) 78 (3): 591-607.
...)° and confirm the correct space group as P 2 1 / c . The crystal structure, refined to R = 4.63% and wR 2 =11.95%, contains one Na site, two distorted octahedral Nb sites and nine O sites. It consists of clusters of four edge-sharing Nb(O,OH) 6 octahedra, linked through shared corners to adjacent clusters...
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Journal Article
Published: 01 March 2014
European Journal of Mineralogy (2014) 26 (2): 309-321.
... in tourmaline causes an increase of both lattice parameters, of <Z–O> and <X–O> bond-lengths and a regular variation of the charge of the Y and Z octahedra. In general, the structure becomes less deformed by reducing the distortion of the octahedra and of the tetrahedral ring. Tourmalines...
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Journal Article
Published: 01 January 2014
American Mineralogist (2014) 99 (1): 190-197.
... indicate Cr 2+ in CrS 6 octahedra. Cr 2+ -silicate meteorite X-ray absorption spectroscopy Olivines [(Mg,Fe) 2 SiO 4 ] within chondrules in chondritic meteorites sometimes contain significant amounts of chromium (Cr) incorporated into the silicate structure upon crystallization from the molten...
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Journal Article
Published: 01 December 2013
Mineralogical Magazine (2013) 77 (8): 3125-3135.
... occupying the channels. Small amounts (<1 wt.%) of Na, K and Cu are probably adsorbed at the channel walls The framework comprises columns of pharmacoalumite-type, intergrown with chiral chains of six cis edge-shared octahedra. It can be described in terms of cubic close packing, with vacancies at both...
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