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nafertisite

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Journal Article
Published: 01 October 2014
European Journal of Mineralogy (2014) 26 (5): 689–700.
...Fernando Cámara; Elena Sokolova; Yassir A. Abdu; Frank C. Hawthorne Abstract The crystal structure of nafertisite, Na 3 Fe 2+ 10 Ti 2 (Si 6 O 17 ) 2 O 2 (OH) 6 F(H 2 O) 2 , from Mt. Kukisvumchorr, Khibiny alkaline massif, Kola peninsula, Russia, a 5.358(1), b 16.204(3), c 21.976(4) Å, β 94.91(1...
FIGURES
Journal Article
Published: 01 December 2006
The Canadian Mineralogist (2006) 44 (6): 1331–1339.
... parameters, X-ray powder-diffraction pattern, chemical composition and infrared spectrum suggest that caryochroite is the second heterophyllosilicate based on a nafertisite-type HOH layer. We evaluate the role of caryochroite and associated titano- and zirconosilicates as catalysts of the in situ formation...
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Journal Article
Published: 01 April 1996
European Journal of Mineralogy (1996) 8 (2): 241–249.
Image
Infrared (IR) spectra of caryochroite (1); nafertisite from the Nanna pegmatite, Igaliko, Greenland (2); holo-type nafertisite from Kukisvumchorr Mt., Khibiny, Kola (3); sepiolite with Mg:Fe = 1.48 from Tyrol, Austria (4); Fe-dominant (almost Mg-free) analogue of sepiolite from Flora Mountain, Lovozero, Kola (5).
Published: 01 December 2006
F ig . 4. Infrared (IR) spectra of caryochroite (1); nafertisite from the Nanna pegmatite, Igaliko, Greenland (2); holo-type nafertisite from Kukisvumchorr Mt., Khibiny, Kola (3); sepiolite with Mg:Fe = 1.48 from Tyrol, Austria (4); Fe-dominant (almost Mg-free) analogue of sepiolite from Flora
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The Mössbauer spectrum of nafertisite fitted with one QSD-site for Fe2+.
Published: 01 October 2014
Fig. 1 The Mössbauer spectrum of nafertisite fitted with one QSD-site for Fe 2+ .
Image
The structure of nafertisite highlighting the (a) H- and O-sheets projected onto (001) and the (b) HOH-block and I-block viewed along the a-axis. The H atoms associated with (OH)− groups linked to octahedra of the O-sheet are shown as small red circles, (H2O) groups (W1) are shown as larger red circles and I-block cations are shown as green circles. Fine dashed black lines outline the unit cell which is halved along the c- and b-axes in (b).
Published: 26 February 2020
Fig. 59. The structure of nafertisite highlighting the ( a ) H - and O -sheets projected onto (001) and the ( b ) HOH-block and I -block viewed along the a -axis. The H atoms associated with (OH) − groups linked to octahedra of the O-sheet are shown as small red circles, (H 2 O) groups (W1
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FTIR, (a) thin film and (b) single crystal, and Raman (c) spectra of nafertisite.
Published: 01 October 2014
Fig. 2 FTIR, (a) thin film and (b) single crystal, and Raman (c) spectra of nafertisite.
Image
Bafertisite-like (B), astrophyllite-like (A) and nafertisite-like (N) HOH layers.
Published: 01 January 2002
Figure 18. Bafertisite-like (B), astrophyllite-like (A) and nafertisite-like (N) HOH layers.
Image
The crystal structure of nafertisite: (a) linkage of H and O sheets in the HOH layer; (b) general view of the structure: self-linkage of adjacent HOH layers via D-XDP-D bridges; (c) a possible short-range-order (SRO) arrangement of K and Na atoms at the A(1) and A(2) sites, respectively. Si tetrahedra are orange, Ti-dominant D and Fe2+-dominant M octahedra are yellow and green, Na [A(2), B sites], K [A(1) site] and (Rb,Cs) [C site] atoms are shown as medium blue and large green and yellow spheres, XDP (=F) anions and OH groups are shown as small yellow and red spheres; an H2O group [W site] is shown as a medium red sphere, H atoms are shown as small grey spheres, hydrogen bonds are shown as dashed black lines; the unit cell is shown with thin black lines.
Published: 01 October 2014
Fig. 3 The crystal structure of nafertisite: (a) linkage of H and O sheets in the HOH layer; (b) general view of the structure: self-linkage of adjacent HOH layers via D-X D P -D bridges; (c) a possible short-range-order (SRO) arrangement of K and Na atoms at the A (1) and A (2) sites
Image
Clinographic view along [010] of the crystal structure of nafertisite (atom coordinates from Ferraris et al. 1996). Yellow tetrahedra and red octahedra form the H sheets; the O sheets consist of blue octahedra.
Published: 01 December 2006
F ig . 1. Clinographic view along [010] of the crystal structure of nafertisite (atom coordinates from Ferraris et al . 1996 ). Yellow tetrahedra and red octahedra form the H sheets; the O sheets consist of blue octahedra.
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View along [100] of the crystal structure of nafertisite. Pairs of Ti polyhedra (dark grey) share a corner across the interlayer space, thus forming [100] channels. Circles as in Figure 4.
Published: 01 January 2005
Figure 5. View along [100] of the crystal structure of nafertisite. Pairs of Ti polyhedra (dark grey) share a corner across the interlayer space, thus forming [100] channels. Circles as in Figure 4 .
Journal Article
Published: 01 October 2013
Mineralogical Magazine (2013) 77 (7): 2955–2974.
... is occupied mainly by K; the A (2) site is partly occupied by K and H 2 O groups, the B site is partly occupied by Na. The crystal structure of veblenite is related to several HOH structures: jinshanjiangite, niobophyllite (astrophyllite group) and nafertisite. The mineral is named in honour of David R...
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Different types of H sheets which are obtained by periodically introducing Ti-octahedra (light gray) in a tetrahedral T sheet: bafertisite-like (B), astrophyllite-like (A) and nafertisite-like (N) H sheets.
Published: 01 January 2002
Figure 17. Different types of H sheets which are obtained by periodically introducing Ti-octahedra (light gray) in a tetrahedral T sheet: bafertisite-like (B), astrophyllite-like (A) and nafertisite-like (N) H sheets.
Image
TOT layer of a phyllosilicate (a) as transformed, by periodic substitution of rows of octahedra (dark grey) for tetrahedra, to HOH heterophyllosilicate layers typical of bafertisite (b), astrophyllite (c) and nafertisite (d). B bafertisite-type and M mica-type modules are shown in (c).
Published: 01 January 2005
Figure 3. TOT layer of a phyllosilicate (a) as transformed, by periodic substitution of rows of octahedra (dark grey) for tetrahedra, to HOH heterophyllosilicate layers typical of bafertisite (b), astrophyllite (c) and nafertisite (d). B bafertisite-type and M mica-type modules are shown
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(a, b, c) Tetrahedral representations of the 1T23T4 ribbon in nafertisite projected (a) onto (010), (b) onto (001), (c) along the a-axis, (d) a ball-and-stick and (e) a graphical representation of the ribbon. Dashed black lines outline the geometrical and topological repeat unit of the ribbon.
Published: 26 February 2020
Fig. 58. ( a , b , c ) Tetrahedral representations of the 1 T 2 3 T 4 ribbon in nafertisite projected ( a ) onto (010), ( b ) onto (001), ( c ) along the a -axis, ( d ) a ball-and-stick and ( e ) a graphical representation of the ribbon. Dashed black lines outline the geometrical
Journal Article
Published: 01 September 2001
European Journal of Mineralogy (2001) 13 (5): 973–984.
... , A.P. , Soboleva , S.V. , Belluso , E. , Pavese , A. ( 1996 ): Nafertisite, a layer titanosilicate member of a poly somatic series including mica . Eur. J. Mineral ., 8 , 241 – 249 . Guinier , A. , Bokij , G.B. , Boll-Dornberger , K. , Cowley , J.M. , Ďurovič...
FIGURES
Journal Article
Published: 01 January 2005
Reviews in Mineralogy and Geochemistry (2005) 57 (1): 69–104.
...Figure 5. View along [100] of the crystal structure of nafertisite. Pairs of Ti polyhedra (dark grey) share a corner across the interlayer space, thus forming [100] channels. Circles as in Figure 4 . ...
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Journal Article
Published: 01 October 2012
Mineralogical Magazine (2012) 76 (5): 1053–1080.
..., amphibole, triple-chain and mica groups. Minerals of the second type are the TS-block minerals, the astrophyllite-group minerals and nafertisite. These constitute the polysomatic series of Thomson ( 1978 ) and the merotype series of Makovicky ( 1997 ) (see also Ferraris, 1997 ; Ferraris and Gula, 2005...
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Journal Article
Published: 01 January 2009
European Journal of Mineralogy (2009) 21 (1): 251–260.
... species [seidite-(Ce) (M31; Khomyakov et al ., 1998 ; Ferraris et al ., 2003 ); nafertisite (M71; Khomyakov et al ., 1995 ; Ferraris et al ., 1996 ); bykovaite (M72; Khomyakov et al ., 2005 )] or better characterized [M51, M55 and M75 (shkatulkalite); Nèmeth, 2004 ]. A part of the Mnn...
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Journal Article
Published: 01 October 2014
Mineralogical Magazine (2014) 78 (5): 1241–1248.
... determined a = 11.600(3), b = 13.856(3), c = 16.516(4) Å, β = 95.84(1)° A paper on the mineral nafertisite has been published recently [ European Journal of Mineralogy , 26 , 689–700 (2014)] in which the ideal chemical formula of the mineral is given as Na 3 Fe 10 2 + Ti 2 (Si 6...