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octahedra

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Journal Article
Published: 01 September 2021
American Mineralogist (2021) 106 (9): 1536.
...Javier Cuadros; Joseph R. Michalski; M. Darby Dyar Abstract The model of Fe 3+ distribution between octahedra and tetrahedra in dioctahedral smectites by Decarreau and Petit (2014) used data from infrared analysis. From their own and other general evidence, the resulting data are likely...
Journal Article
Published: 01 September 2021
American Mineralogist (2021) 106 (9): 1534–1535.
FIGURES
Journal Article
Published: 02 August 2021
The Canadian Mineralogist (2021) 59 (3): 551–572.
... network equations structural strain ribbon of edge-sharing octahedra crystal-chemistry bond strain index (BSI) rare earth elements (REE) All specimens studied here were acquired from museum collections: from the Canadian Museum of Nature in Ottawa, Canada [CMN 46577 (CMN01), HC 10526...
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Journal Article
Published: 01 April 2021
The Canadian Mineralogist (2021) 59 (1): 9–30.
...Aaron J. Lussier; Frank C. Hawthorne ABSTRACT Infinite chains of edge-sharing octahedra occur as fundamental building blocks (FBBs) in the structures of several hundred mineral species. Such chains consist of a backbone of octahedra to which decorating polyhedra may be attached. The general...
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Journal Article
Published: 08 January 2021
The Canadian Mineralogist (2021) 59 (1): 43–57.
... different cation/anion sites and the large number of chemical substitutions possible at these sites ( e.g ., Hawthorne & Oberti 2007 ). The main structural unit is an I-beam consisting of a strip of M (1), M (2), and M (3) octahedra (containing C-group cations, Fig. 1 ) sandwiched between two...
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Journal Article
Published: 17 September 2020
Mineralogical Magazine (2020) 84 (5): 640–652.
...-dimensional kagomé networks in minerals where the kagomé node atoms are octahedrally coordinated in hexagonal tungsten bronze (HTB) arrays. Octahedral tilting, coupled with capping of the apical anions of the triangular groupings of octahedra in the HTB layers, gives rise to several important mineral groups...
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Journal Article
Published: 01 September 2020
American Mineralogist (2020) 105 (9): 1432–1435.
... of the structure of Si-rich Mg-sursassite determined in this study projected onto the (010) plane. Blue = isolated SiO 4 and Si 2 O 7 sorosilicate groups, pink = M 4 and M 5 octahedra (Al), green = M 3 octahedron (50%Al, 50%Si), orange spheres = M 1 (Mg) and M 2 (Mg). Rows of M (2,3,4,5) octahedra and VII...
FIGURES
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
The Canadian Mineralogist (2018) 56 (5): 811–820.
...+ 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. §   Corresponding author e-mail address : akampf@nhm.org 9 May...
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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
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
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 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 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 April 2018
Mineralogical Magazine (2018) 82 (2): 291–299.
... 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 [001], approximately normal to the diagram. The chains are interconnected via corner-sharing with P1O 4 and P2O 4 tetrahedra to form laueite-related layers parallel to {100}. Fe...
FIGURES
Journal Article
Published: 01 March 2018
American Mineralogist (2018) 103 (3): 462–468.
... by computations, which predicted the octahedral rotation ( c pc / a pc > 1) as an origin of the non-cubic structure. Instead, the experimental observation is more straightforward to understand if one of the three axes of the SiO 6 octahedra is shorter than the other two (therefore, direct distortion...
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