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narsarsukite

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Journal Article
Published: 12 September 2023
Mineralogical Magazine (2023) 87 (6): 896–907.
...Silvio R.F. Vlach; Frederico C.J. Vilalva Abstract We report textural and compositional data for the titanosilicate narsarsukite [Na 2 (Ti,Fe 3+ )Si 4 (O,F) 11 ] in peralkaline granites from the Papanduva Pluton in Graciosa Province, south-southeastern Brazil. Two distinct narsarsukite generations...
FIGURES | View All (9)
Journal Article
Published: 01 April 2017
Mineralogical Magazine (2017) 81 (2): 339–354.
...E. Schingaro; E. Mesto; M. Lacalamita; F. Scordari; E. Kaneva; F. N. Vladykin Abstract A crystal chemical study of narsarsukite from the Murun alkaline massif, Russia has been carried out combining single-crystal X-ray diffraction, electron microprobe analyses, micro-Fourier transform infrared...
FIGURES | View All (4)
Journal Article
Published: 01 January 2004
European Journal of Mineralogy (2004) 16 (1): 143–149.
..., eight-coordinated K atom. K 2 ScFSi 4 O 10 is isotypic with narsarsukite Na 2 (Ti, Fe 3+ )(O, F)Si 4 O 10 , but, although their topologies are basically identical, there exist differences which cause the merohedral twinning and pseudo-holohedry (pseudo- I4/mmm ) of K 2 ScFSi 4 O 10 : the presence...
FIGURES
Journal Article
Published: 01 June 1991
European Journal of Mineralogy (1991) 3 (3): 575–586.
Journal Article
Published: 01 June 1966
The Canadian Mineralogist (1966) 8 (4): 506–514.
...K. C. Rajasekaran Abstract The occurrence of narsarsukite in association with neptunite in the hornfels collar around the alkaline igneous pluton of Mont St. Hilaire, Quebec, is reported. The optical, chemical and X-ray data for narsarsukite are presented and compared with those available...
Journal Article
Published: 01 June 1962
American Mineralogist (1962) 47 (5-6): 539–556.
...Donald R. Peacor; M. J. Buerger Abstract The symmetry of narsarsukite is I 4/ m with a = 10.726 9 Å and c = 7.947 6 Å. The unit-cell content is ideally 4(Na 2 TiOSi 4 O 10 ). Intensity data obtained with the single-crystal Geigercounter diffractometer were used to compute the three-dimensional...
Journal Article
Published: 01 April 1959
American Mineralogist (1959) 44 (3-4): 265–273.
...D. B. Stewart Abstract Narsarsukite, Na 2 TiSi 4 O 11 , is described from the second of three localities in the Sweetgrass Hills, Montana. Narsarsukite is associated with manganpectolite, quartz, calcite, and galena in veins cutting an orthoclase-albite-aegirine-quartz hybrid rock in a zone...
Journal Article
Published: 01 August 1935
American Mineralogist (1935) 20 (8): 598–601.
Journal Article
Published: 01 November 1934
American Mineralogist (1934) 19 (11): 546–548.
...B. E. Warren; C. R. Amberg Abstract Narsarsukite Na 2 (Ti, Fe)Si 4 O 11 , a tetragonal crystal, has been found to have cell dimensions “a” = 10.74Å, “c” = 7.90Å, and to contain 4 molecules per unit cell. The axial ratio is 0.735 instead of 0.5235 (Dana), and the perfect cleavage assumed by Dana...
Image
Main textural features of magmatic and post-magmatic <span class="search-highlight">narsarsukite</span> generatio...
Published: 12 September 2023
Figure 3. Main textural features of magmatic and post-magmatic narsarsukite generations from the Papanduva Pluton, Graciosa Province. (a) Larger magmatic crystals showing colour zoning and abundant minute inclusions in the yellow–orange intermediate zone, in plane-polarised light; (b) same
Image
BSE and compositional maps for the <span class="search-highlight">narsarsukite</span> crystal shown in  Fig. 3a,b...
Published: 12 September 2023
Figure 4. BSE and compositional maps for the narsarsukite crystal shown in Fig. 3a,b . (a) BSE image (compositional mode); (b), (c), (d), (e) and (f) compositional maps for the indicated elements. EDS signals for Ti and WDS signals for the other elements are represented. The two elongated pits
Image
Main compositional variations in <span class="search-highlight">narsarsukite</span> from the Papanduva Pluton. (a...
Published: 12 September 2023
Figure 5. Main compositional variations in narsarsukite from the Papanduva Pluton. (a) Al vs. Zr and Fe 3+ vs. Zr (in the inset) and (b) Fe 3+ vs. Al diagram. Note that Fe 3+ and Al contents show a positive correlation in the magmatic generation, but a negative correlation in the post
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ANALYSES OF <span class="search-highlight">NARSARSUKITE</span>
Published: 20 July 2023
TABLE 4. ANALYSES OF NARSARSUKITE
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Variation of Fe 2 O 3  and TiO 2  (wt.%) abundances in <span class="search-highlight">narsarsukite</span>. The da...
Published: 20 July 2023
Fig. 6. Variation of Fe 2 O 3 and TiO 2 (wt.%) abundances in narsarsukite. The data source for experimental phases is contained in Supplementary Table 1. Comparative data: Igdlutalik, Greenland ( Upton et al . 1976 ); Narssârssuk, Greenland (listed in Anthony et al . 2017 ); Ilímaussaq
Journal Article
Published: 20 July 2023
The Canadian Journal of Mineralogy and Petrology (2023) 61 (3): 593–608.
...TABLE 4. ANALYSES OF NARSARSUKITE ...
FIGURES | View All (8)
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BSE images of representative textural relationships in CF-13. (a) Chevkinit...
Published: 20 July 2023
Fig. 3. BSE images of representative textural relationships in CF-13. (a) Chevkinite-(Ce) (Cvk) with abundant pore spaces rimmed by subhedral gagarinite-(Ce) (Gag) and then by massive narsarsukite (Nar) with albite (Ab) inclusions. (b) More complex textures involving the same phases. Px, sodic
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(a) Multi-element diagram showing the behaviour of selected trace elements ...
Published: 12 September 2023
Figure 8. (a) Multi-element diagram showing the behaviour of selected trace elements in magmatic (1 st gen.) and post-magmatic (2 nd gen.) narsarsukite, normalised to the respective host rocks. Average data are presented for the magmatic generation; for the post-magmatic case, this is the only
Image
Fluorcaphite-bearing albitite from Lovozero: characteristic textures. Photo...
Published: 01 April 2005
is narsarsukite. (b) Narsarsukite porphyroblast (yellow to cyan interference colors) filled with numerous inclusions of albite (white to gray) and sodic amphibole (purple and dark green). (c) Inclusions of aegirine (yellowish green), sodic amphibole (pleochroic from olive-green to grayish blue) and albite
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Sketch of the crystal structure of <span class="search-highlight">narsarsukite</span>. The sizes of cavities are ...
Published: 01 April 2017
Fig. 3. Sketch of the crystal structure of narsarsukite. The sizes of cavities are the average of the values obtained for the nar_1 and nar_2 crystals. ( a ) Two [Si 8 O 20 ] 8− chains and their linkage to the [TiO 5 ] 6− octahedral chain. Yellow and brown tetrahedra represent upwards
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The structure of  <span class="search-highlight">narsarsukite</span>  projected ( a ) onto (010) and ( b ) along ...
Published: 26 February 2020
Fig. 45. The structure of narsarsukite projected ( a ) onto (010) and ( b ) along the c -axis. Fine dashed black lines outline the unit cell and H atoms associated with (OH) – groups have been omitted for clarity