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vicanite group

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Journal Article
Published: 04 March 2021
The Canadian Mineralogist (2021) 59 (1): 177–189.
... )(BO 3 )F 11 . Arrheniusite-(Ce) belongs to the vicanite group of minerals and is distinct from other isostructural members mainly by having a Mg-dominant, octahedrally coordinated site ( M 6); it can be considered a Mg-As analog to hundholmenite-(Y). The threefold coordinated T 5 site is partly...
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Journal Article
Published: 01 October 2008
Mineralogical Magazine (2008) 72 (5): 1071–1082.
...G. Raade; J. D. Grice; M. Erambert; P. Kristiansson; T. Witzke Abstract A REE -bearing fluorosilicate from the Tommot REE -Nb deposit in Yakutia, Russia, described without a name in 1966, is characterized here as a new species, proshchenkoite-(Y), of the vicanite group of borosilicates. Wavelength...
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Journal Article
Published: 01 April 2007
Mineralogical Magazine (2007) 71 (2): 179–192.
... 3 . * E-mail: gunn-ra@online.no 17 07 2007 18 05 2007 © The Mineralogical Society 2007 hundholmenite-(Y) new mineral species vicanite group REE borosilicate electron microprobe data crystal structure Hundholmen granite pegmatite Norway T he new...
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COMPARISON OF <b>VICANITE</b>-<b>GROUP</b> MINERALS (MODIFIED FROM  UVAROVA  et al . 2013...
Published: 04 March 2021
TABLE 8. COMPARISON OF VICANITE-GROUP MINERALS (MODIFIED FROM UVAROVA et al . 2013 ) IN TERMS OF THE DOMINANT CATION AT THE SPECIFIC CRYSTALLOGRAPHIC SITES
Journal Article
Published: 01 October 2004
American Mineralogist (2004) 89 (10): 1540–1545.
...Massimo Boiocchi; Athos Callegari; Luisa Ottolini; Adriana Maras Abstract The structure of okanoganite-(Y), a rare REE-rich borofluorosilicate, was refined in space group R 3 m , starting from the atomic coordinates of vicanite-(Ce), to a final R -factor of 0.032 for 1857 observed reflections...
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Journal Article
Published: 01 August 2002
American Mineralogist (2002) 87 (8-9): 1139–1143.
... . The structure of vicanite-(Ce) consists of three distinct layers: Layer A at z ca. 0 (1/3, 2/3) (Fig. 1 ) consists of an Fe(SiO 4 ) 6 group and a threefold B 3 O 9 borate ring. The FeO 6 octahedron shares its oxygen atoms with six SiO 4 groups, three Si1 and three Si2. Each B1 tetrahedron...
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Journal Article
Published: 01 February 2012
Mineralogical Magazine (2012) 76 (1): 151–155.
.... Sokolova and F.C. Hawthorne *E-mail: pla@fmm.ru Structurally related to structurally related to the okanoganite–vicanite group Hexagonal: R 3 m ; structure determined a = 10.804(2), c = 27.726(6) Å 4.41(29), 3.13(26), 3.03(100), 2.982(85), 2.954(60), 2.689(40), 1.797(31), 1.770...
Journal Article
Published: 01 October 2014
American Mineralogist (2014) 99 (10): 2150–2158.
... (2013) Laptevite-(Ce) NaFe 2+ (REE 7 Ca 5 Y 3 )(SiO 4 ) 4 (Si 3 B 2 PO 18 )(BO 3 )F 11 —a new vicanite-group mineral from Darai-Pioz alkaline massif. Novye dannye o mineralakh (New data on minerals), 48, 5–11 (in Russian). Y.A. Uvarova, E. Sokolova, F.C. Hawthorne, A.A. Agakhanov, V.Y. Karpenko...
Journal Article
Published: 01 February 2011
Mineralogical Magazine (2011) 75 (1): 33–43.
... species were found: vicanite-(Ce) ( Maras et al. , 1995 ; Ballirano et al. , 2002 ), peprossiite-(Ce) ( Della Ventura et al. , 1993 ; Callegari et al. , 2000 ), stoppaniite ( Ferraris et al. , 1998 ; Della Ventura et al. , 2000 ) and piergorite-(Ce) ( Boiocchi et al. , 2006 ). Furthermore, some...
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Journal Article
Published: 01 July 2006
American Mineralogist (2006) 91 (7): 1170–1177.
... synthesis from X-ray diffraction data [monoclinic, space group P 2/ a , a = 28.097(3) Å, b = 4.777(1) Å, c = 10.236(2) Å, β = 96.81(1)°, V = 1364.2(7) Å 3 , Z = 2] and was refined to a final R obs = 0.059 for 6480 F o with I o > 3σ ( I o ). The structure shows similarities with the hellandite group...
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Journal Article
Published: 01 October 2012
European Journal of Mineralogy (2012) 24 (6): 1053–1060.
...) from Norway - A new mineral species in the vicanite group: descriptive data and crystal structure . Mineral. Mag. , 71 , 179 – 192 . Ricchiardi G. Damin A. Bordiga S. Lamberti C. Spano G. Rivetti F. Zecchina A. ( 2001 ): Vibrational structure of titanium silicate...
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Journal Article
Published: 01 April 2005
American Mineralogist (2005) 90 (4): 768–773.
... of the labuntsovite group and includes absorption bands at 3580, 1638, 1605, 1076, 1020, 940, 771, 690 (Ti-O stretching), 587, 505, 463 and 420 cm −1 . Lepkhenelmite-Zn is biaxial positive, α = 1.683(2), β = 1.692(2), γ = 1.795(4), 2 V obs = 30(10)°, 2 V calc = 34.5°. It shows weak pleochroism, is colourless...
Journal Article
Published: 01 July 2008
American Mineralogist (2008) 93 (7): 996–1004.
... of gadolinite-(Y) from Vico required nonstandard procedures. After correction for (100) twinning, the structure of a crystal with unit-cell dimensions a = 4.7708(4) Å, b = 7.6229(7) Å, c = 9.8975(9) Å, β = 90.017(7)°, and V = 359.95(6) Å 3 was refined in the P 2 1 / c space group down to R = 2.3%. Electron...
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Journal Article
Published: 01 September 2018
American Mineralogist (2018) 103 (9): 1497–1501.
... or hydrochloric acid. An electron microprobe analysis yielded an empirical formula (based on 14 O apfu) Ca 2.98 (AsO 4 ) 2.00 [As(OH) 3 ] 2.00 . Segerstromite is cubic, with space group I 2 1 3 and unit-cell parameters a = 10.7627(2) Å, V = 1246.71(4) Å 3 , and Z = 4. Its crystal structure is constructed from...
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Journal Article
Published: 01 August 2015
Mineralogical Magazine (2015) 79 (4): 949–963.
.... Sokolova E.V. Hawthorne F.C. Karpenko V.Y. ( 2013 ) Laptevite-(Ce) NaFe 2+ ( REE 7 Ca 5 Y 3 ) (SiO 4 ) 4 (Si 3 B 2 PO 18 )(BO 3 )F 11 – new mineral of the vicanite group from the Darai-Pioz alkaline massif, Tajikistan . Novye Dannye o Mineralakh , 48 , 5 – 11 [in Russian...
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Journal Article
Published: 01 May 2002
American Mineralogist (2002) 87 (5-6): 739–744.
...Giancarlo Della Ventura; Paola Bonazzi; Roberta Oberti; Luisa Ottolini Abstract Two new minerals of the hellandite group were found within alkali-syenitic ejecta enclosed in pyroclastic formations of the Roman Comagmatic Province (Latium, Italy). Mottanaite-(Ce) [ideally X Ca Y 4 (CeCa) Z Al T Be 2...
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Journal Article
Published: 01 September 2001
American Mineralogist (2001) 86 (9): 1066–1075.
...-microprobe analyses for low- Z (H, Li, Be, B, F) and high- Z elements (Ba, Y, REE and actinides), and high-quality ( R obs 1.2–2.6) single-crystal structure refinements. Structure refinements indicate that the best approximation to the real symmetry is the P 6 3 space group. In britholite, the lowering...
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Journal Article
Published: 01 January 2014
American Mineralogist (2014) 99 (1): 157–169.
... gatelite group, in which ET polysomes are composed of E modules with epidote-type structure alternating with T modules of törnebohmite-type structure. The two new minerals form a continuous solid-solution series, along which two crystals of intermediate compositions served for species definition...
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Journal Article
Published: 01 July 2018
Clays and Clay Minerals (2018) 66 (3): 297–314.
... plotting software and each new example was validated before being added to a group of spectra considered for incorporation into the on-board library of the handheld ASD-TerraSpec Halo near-infrared (NIR) mineral identification instrument. Spectra from an additional suite of mineral samples of the NMC...
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