1-20 OF 92 RESULTS FOR

octahedra

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 18 January 2024
The Canadian Journal of Mineralogy and Petrology (2024) 62 (1): 117–132.
... of chains of distorted octahedrally coordinated Na + and regular Mg[O(H 2 O) 5 ] octahedra. The observed low incident bond valence to the V1 site (4.45 vu ) and marked deviation in vanadyl and V–O eq bond lengths indicate that this site is host to the essential Ti 4+ identified during chemical analyses...
FIGURES | View All (7)
Journal Article
Published: 28 December 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (6): 1151–1162.
...), c = 7.4861(3) Å, β = 112.779(2)°, V = 583.03(5) Å 3 , and Z = 4. The crystal structure of virgilluethite, which is topologically identical to that of tungstite (WO 3 ·H 2 O), is characterized by highly distorted and elongated MoO 5 (H 2 O) octahedra that share four corners in the equatorial plane...
FIGURES | View All (8)
Journal Article
Published: 01 November 2023
American Mineralogist (2023) 108 (11): 2065–2074.
FIGURES | View All (9)
Journal Article
Published: 01 November 2023
American Mineralogist (2023) 108 (11): 2142–2150.
... . Yakubovichite is the first mineral that crystallizes in the α-CrPO 4 structure type ( Attfield et al. 1988 ). The crystal structure was solved and refined on the holotype material from the Jordan locality. It represents a framework built up of corner- and edge-sharing [ M O 6 ] octahedra, and [PO 4...
FIGURES | View All (6)
Journal Article
Published: 01 November 2023
American Mineralogist (2023) 108 (11): 2131–2141.
...: ( a ) [001]; ( b ) [112]; and ( c ) [110]. (Color online.) Figure 3. Polyhedral drawing of the β-MnOOH (feitknechtite) structure looking ( a ) along b , and ( b ) along c , and ( c ) for MnOOH-Phase 2 along b . The Mn 3+ -O octahedra are shown in red, and the O/OH positions are plotted as blue...
FIGURES | View All (12)
Journal Article
Published: 01 October 2023
American Mineralogist (2023) 108 (10): 1840–1851.
FIGURES | View All (7)
Journal Article
Published: 29 September 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (5): 979–986.
... that it crystallizes as a structural variant of the putative (AlV 4+,5+ 14 O 40 ) n − vanadoaluminate complex, [AlV 4+ V 5+ 12 O 39 ] 11− . That variant is derived through the random removal of one of the two apical vanadate octahedra, elucidating the cause of difficulties in the refinement of the preliminary...
FIGURES
Journal Article
Published: 29 September 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (5): 987–998.
... group Cmc 2 1 with unit-cell parameters a = 16.2392(2), b = 10.96370(10), c = 15.3367(2) Å, V = 2730.57(5) Å 3 , and Z = 4. Its crystal structure is characterized by clusters of six-membered rings of edge-sharing AlO 6 octahedra with an SiO 3 (OH) tetrahedron situated at the center of each ring...
FIGURES | View All (7)
Journal Article
Published: 29 September 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (5): 965–977.
... . 2002 ). Therefore, with regard to the low distortion of both A O 6 and B O 6 octahedra and the mismatch between bond-valence sums and the theoretical cation charges in the crystal-structure model of stibiotantalite originally proposed by Dihlström (1938) , it is clear that the correct structure...
FIGURES | View All (6)
Journal Article
Published: 01 August 2023
American Mineralogist (2023) 108 (8): 1476–1482.
... and Wedde 1974 ). The primitive unit cell of gibbsite contains two sheets of Al octahedra. Half of the hydroxyls on the dioctahedral sheet lie parallel to the sheet, and the rest stand normal to the sheet because one-third of the cation sites within the gibbsite sheet are vacant ( Fig. 1a ). In contrast...
FIGURES | View All (7)
Journal Article
Journal: Elements
Published: 01 August 2023
Elements (2023) 19 (4): 215–221.
FIGURES | View All (5)
Journal Article
Published: 03 July 2023
American Mineralogist (2023) 108 (7): 1357–1367.
... are as follows: a = 5.294 Å, b = 9.162 Å, c = 12.800 Å, α = 90.788°, β = 98.345°, and γ = 90.399° ( Fig. 10 and CIF 1 ). Figure 10. The front ( a and a′ ), side ( b and b′ ), and top ( c and c′ ) views of optimized crystal structure of zincsilite. The octahedra and atoms in blue represent...
FIGURES | View All (10)
Journal Article
Published: 29 June 2023
Mineralogical Magazine (2023) 87 (4): 599–610.
... coordination polyhedra ( A 1; A 2), two by octahedra ( M 1,2; M 3), three by tetrahedra ( T 1; T 2; T 3), and ten anionic positions, the O10 position being occupied by an OH group. Substitutions of Fe 3+ , Cr 3+ , Mn 2+ and V 3+ ions replacing Al 3+ in the structure are commonly present (Dörsam et al...
FIGURES | View All (5)
Journal Article
Published: 01 June 2023
American Mineralogist (2023) 108 (6): 1161–1170.
FIGURES | View All (5)
Journal Article
Published: 01 June 2023
American Mineralogist (2023) 108 (6): 1149–1160.
... absorption bands in UV/Vis spectra, but it can cause an increase in the intensity of both spin-allowed and spin-forbidden crystal-field transitions. The garnet crystal structure is shown in Figure 1a . Local structural relationships between neighboring octahedra and dodecahedra, which contain...
FIGURES | View All (6)
Journal Article
Published: 30 March 2023
Mineralogical Magazine (2023) 87 (3): 369–381.
FIGURES | View All (9)
Journal Article
Published: 25 January 2023
Mineralogical Magazine (2023) 87 (3): 407–414.
... 2 1 /c and unit-cell parameters a = 16.5016(5), b = 7.7703(2), c = 9.8524(3) Å, β = 98.258(3)°, V = 1250.21(6) Å 3 and Z = 4. The crystal structure of bernardevansite consists of a corner-sharing framework of M 3+ O 6 ( M = Al and Fe) octahedra and Se 4+ O 3 trigonal pyramids, leaving large voids...
FIGURES | View All (8)
Journal Article
Published: 09 December 2022
Mineralogical Magazine (2023) 87 (2): 218–224.
... consists of alternating edge-sharing Cu 2+ (OH) 6 octahedra and two Cu 2+ (OH) 4 Cl 2 octahedra, whereas the other one is based on Cu + Cl 4 tetrahedra forming edge-sharing Cu + 2 Cl 6 dimers. * Author for correspondence: Inna Lykova, Email: ilykova@nature.ca Associate Editor: Owen Missen...
FIGURES | View All (8)
Journal Article
Published: 21 November 2022
Mineralogical Magazine (2023) 87 (2): 186–193.
... contains Tl 3+ Cl 6 octahedra and K-centred polyhedra of three types: KCl 8 , KCl 8 (H 2 O) and KCl 7 (H 2 O) 2 . The mineral is named as a kali um– thall ium ordered compound. * Author for correspondence: Igor V. Pekov, Email: igorpekov@mail.ru † Deceased 20 March 2021 Associate...
FIGURES | View All (4)
Journal Article
Published: 08 September 2022
Mineralogical Magazine (2023) 87 (1): 18–33.
... ) of anions (or close to it). Only octahedral voids of hcp are occupied. As a result, the coordination number of M -type cations is 6 (sometimes augmented to 8 in the case of a slight distortion of hcp ). The presence of zig-zag chains of edge-shared octahedra (the idealised symmetry described...
FIGURES | View All (15)