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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 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: 12 February 2019
Mineralogical Magazine (2019) 83 (4): 497–505.
... that of the latter (11.86 Å 3 ); the T O 4 tetrahedra in the blue diopside (<λ tet > =1.006; σ θ(tet) 2 = 24.37–24.69) are less distorted than that of the green diopside (<λ tet > = 1.007; σ θ(tet) 2 = 27.94); the M 1O 6 octahedra in the former (<λ oct > =1.006; σ θ(oct) 2 = 20.39–21.13) are more...
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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
European Journal of Mineralogy (2018) 30 (5): 917–928.
... d elements were analysed. We establish that the incorporation of Me 3+ cations is controlled by the ratio between the sizes of Y O 6 and Z O 6 octahedra and does not exceed eight atoms per formula unit (apfu), while the incorporation of Me 2+ cations is controlled by the charge balance and does...
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Journal Article
Published: 01 September 2018
European Journal of Mineralogy (2018) 30 (5): 957–966.
... be obtained when the tetrahedra and octahedra are used for the construction of a mixed tetrahedral-octahedral or heteropolyhedral framework ( Fig. 3 ). The principal building unit of this three-dimensional net are infinite chains running parallel to [0 0 1] built from corner sharing [CaO 6 ] and [SiO 4...
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Journal Article
Journal: Clay Minerals
Published: 01 September 2018
Clay Minerals (2018) 53 (3): 497–503.
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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): 609–620.
... of synthetic cobaltoan malachites shows a decrease in unit-cell volume, with an anisotropic contraction of unit-cell parameters, with increasing Co content. The major progressive shortening of apical bonds in Me 2 octahedra, with consequent regularization of the Jahn-Teller distorted Cu octahedra, drives...
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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.
... (OH) 2 (H 2 O) 2 (PO 4 ) 2 ] 2– that are interconnected via corner-sharing of the PO 4 tetrahedra with trans -MnO p2 (H 2 O) 4 octahedra (O p  = oxygen coordinated to P). The interlayer separation in strunzite is much shorter (9.0 Å) than that for stewartite, laueite and pseudolaueite (9.9 to 10.0...
FIGURES
Journal Article
Published: 01 March 2018
American Mineralogist (2018) 103 (3): 462–468.
...-Knutson et al. 2002 ; Shim et al. 2002 ; Caracas et al. 2005 ; Jung and Oganov 2005 ; Adams and Oganov 2006 ; Caracas and Wentzcovitch 2006 ; Li et al. 2006 ; Uchida et al. 2009 ). The focus of our experiments presented here is: should the direct distortion of the SiO 6 octahedra (for example, P...
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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 November 2016
European Journal of Mineralogy (2016) 28 (4): 825–834.
... is trigonal, space group P 3 m 1, with a = 7.8211(6) Å, c = 17.281(1) Å, V = 917.8(1) Å 3 (hexagonal setting) and Z = 6. Layer modules (A–F) stacked along the c -axis form the crystal structure of Pd 3 HgTe 3 . Module A is composed of isolated octahedra [PdTe 6 ], which share faces with adjacent octahedra...
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Journal Article
Journal: Clay Minerals
Published: 01 September 2016
Clay Minerals (2016) 51 (4): 675–689.
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Journal Article
Published: 01 May 2016
The Canadian Mineralogist (2016) 54 (3): 707–713.
... by Hawthorne (1985) , but detailed examination of the structural connectivity shows that schneiderhöhnite is better described as a sheet structure than as a framework structure. Zig-zag chains of edge-sharing Fe (1), Fe (2), Fe (3) (= Fe 3+ ) octahedra extend parallel to the c axis, and these chains are cross...
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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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