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Journal Article

Trinepheline and fabriesite: two new mineral species from the jadeite deposit of Tawmaw (Myanmar)

Cristiano Ferraris, Gian Carlo Parodi, Sylvain Pont, Benjamin Rondeau, Jean-Pierre Lorand
Published: 01 March 2014
European Journal of Mineralogy (2014) 26 (2): 257–265.
DOI: https://doi.org/10.1127/0935-1221/2014/0026-2348
...Cristiano Ferraris; Gian Carlo Parodi; Sylvain Pont; Benjamin Rondeau; Jean-Pierre Lorand Abstract Two new mineral species, trinepheline (NaAlSiO 4 ) and fabriesite (Na 3 Al 3 Si 3 O 12 · 2H 2 O), are described from late-stage metamorphic veins of the jadeite deposit of Tawmaw-Hpakant (Myanmar...
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Journal Article

On the existence of a Na-deficient monoclinic trinepheline with composition Na 7.85 Al 7.85 Si 8.15 O 32

Predrag Vulić, Volker Kahlenberg, Jürgen Konzett
Published: 01 July 2008
American Mineralogist (2008) 93 (7): 1072–1079.
DOI: https://doi.org/10.2138/am.2008.2702
... is monoclinic with space group symmetry P 112 1 , a = 9.9897(6) Å, b = 9.9622(6) Å, c = 24.979(2) Å, and γ = 119.788(4)°. The twinning of three individuals related by rotation around the c direction for 120° was accounted for in the calculation. The phase was named monoclinic trinepheline because the length...
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View PDF for article title, On the existence of a Na-deficient monoclinic <span class="search-highlight">trinepheline</span> with composition Na 7.85 Al 7.85 Si 8.15 O 32
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Journal Article

Crystal structure of hexagonal trinepheline; a new synthetic NaAlSiO 4 modification

V. Kahlenberg, H. Bohn
Published: 01 June 1998
American Mineralogist (1998) 83 (5-6): 631–637.
DOI: https://doi.org/10.2138/am-1998-5-623
... twinning by merohedry according to m 210 , which was accounted for in the calculations. The phase was named trinepheline, following prior studies, because the length of its c lattice parameter is three times the length of the c parameter in nepheline, whereas the a parameter is about 10 Aa in both phases...
View PDF for article title, Crystal structure of hexagonal <span class="search-highlight">trinepheline</span>; a new synthetic NaAlSiO 4 modification
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Comparison of the calculated XRPD diagrams of four different nepheline-like compounds: (a) classical Na-nepheline, (b) hexagonal trinepheline, (c) monoclinic trinepheline, (d) orthorhombic trinepheline, and (e) XRPD data for sample (1000 °C, 4 h). The numbers are denoting the most intense peaks, while the arrows are pointing to the most prominent differences.

Comparison of the calculated XRPD diagrams of four different nepheline-like...

Published: 01 September 2013
Fig. 2 Comparison of the calculated XRPD diagrams of four different nepheline-like compounds: (a) classical Na-nepheline, (b) hexagonal trinepheline, (c) monoclinic trinepheline, (d) orthorhombic trinepheline, and (e) XRPD data for sample (1000 °C, 4 h). The numbers are denoting the most intense
Journal Article

Reinvestigation of pure Na-nepheline like compounds obtained from the thermal conversion of zeolite LTA

Predrag Vulić, Volker Kahlenberg, Christian Gspan, Radovan Dimitrijević
Published: 01 September 2013
European Journal of Mineralogy (2013) 25 (3): 473–478.
DOI: https://doi.org/10.1127/0935-1221/2013/0025-2293
...Fig. 2 Comparison of the calculated XRPD diagrams of four different nepheline-like compounds: (a) classical Na-nepheline, (b) hexagonal trinepheline, (c) monoclinic trinepheline, (d) orthorhombic trinepheline, and (e) XRPD data for sample (1000 °C, 4 h). The numbers are denoting the most intense...
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Includes: Supplemental Content
Image
(a) Secondary-electron (SE) image (centre) and trinepheline EBSD patterns (left and right top sides) collected at the red circles on the SE image (red filled circles). The left diffraction pattern corresponds to the bottom point of the SE image. Below each experimental EBSD pattern the indexing obtained using data from ICSD 85553 (Kahlenberg &amp; Böhm, 1998) is reported; jd = jadeite, nat = natrolite, ban = banalsite, tri = trinepheline, nph = nepheline. (b) Secondary-electron image (right) and fabriesite EBSD patterns (left top) collected at the red circle on the SE image; jd = jadeite; nat = natrolite; ban = banalsite; tri = trinepheline; fab = fabriesite. Below the EBSD pattern is the indexing of the Kikuchi lines obtained using data from ICSD 201460 (Hansen &amp; Fälth, 1982).

(a) Secondary-electron (SE) image (centre) and trinepheline EBSD patterns (...

Published: 01 March 2014
Fig. 4 (a) Secondary-electron (SE) image (centre) and trinepheline EBSD patterns (left and right top sides) collected at the red circles on the SE image (red filled circles). The left diffraction pattern corresponds to the bottom point of the SE image. Below each experimental EBSD pattern
Image
Rietveld plot of the X-ray powder diffraction pattern of the material obtained from zeolite LTA (1000 °C, 4 h, recorded on a Philips PW-1710 automated diffractometer, CuKα1,2) modelled as a binary mixture of pure sodium nepheline and a monoclinic trinepheline phase. Tick marks for the Bragg peaks for Na-nepheline (upper row) and for monoclinic trinepheline (lower row) are given. The lower line represents the difference curve between observed and calculated step intensities.

Rietveld plot of the X-ray powder diffraction pattern of the material obtai...

Published: 01 September 2013
Fig. 3 Rietveld plot of the X-ray powder diffraction pattern of the material obtained from zeolite LTA (1000 °C, 4 h, recorded on a Philips PW-1710 automated diffractometer, Cu K α 1,2 ) modelled as a binary mixture of pure sodium nepheline and a monoclinic trinepheline phase. Tick marks
Image
SAED diffraction pattern of a monoclinic trinepheline crystallite showing superstructure reflections parallel to c*, i.e. a tripling of the c lattice parameter.

SAED diffraction pattern of a monoclinic trinepheline crystallite showing s...

Published: 01 September 2013
Fig. 1 SAED diffraction pattern of a monoclinic trinepheline crystallite showing superstructure reflections parallel to c *, i.e . a tripling of the c lattice parameter.
Image
Crystal structure of monoclinic trinepheline viewed parallel to c. Sodium ions are represented by thermal ellipsoids (50% probability level).

Crystal structure of monoclinic trinepheline viewed parallel to c . Sodium...

Published: 01 July 2008
F igure 2. Crystal structure of monoclinic trinepheline viewed parallel to c . Sodium ions are represented by thermal ellipsoids (50% probability level).
Journal Article

New Mineral Names,

Dmitriy Belakovskiy, Fernando Cámara, Yulia Uvarova, Olivier C. Gagne
Published: 01 August 2014
American Mineralogist (2014) 99 (8-9): 1806–1813.
DOI: https://doi.org/10.2138/am.2014.650
...Dmitriy Belakovskiy; Fernando Cámara; Yulia Uvarova; Olivier C. Gagne This New Mineral Names has entries for 13 new mineral species, including arsiccioite, bluelizardite, diegogattaite, disulfodadsonite, fabriesite, laachite, oskarssonite, philrothite, putnisite, therasiaite, trinepheline...
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Journal Article

Davidsmithite, (Ca,□) 2 Na 6 Al 8 Si 8 O 32 : a new, Ca-bearing nepheline-group mineral from the Western Gneiss Region, Norway

Sid-Ali Kechid, Gian Carlo Parodi, Sylvain Pont, Roberta Oberti
Published: 26 June 2017
European Journal of Mineralogy (2017) 29 (6): 1005–1013.
DOI: https://doi.org/10.1127/ejm/2017/0029-2667
... Si 3 O 12 ·2H 2 O, a hydrate mineral with, otherwise, the same chemistry as trinepheline but with a completely different structure. The new mineral davidsmithite, with ideal chemical composition (Ca□) 2 Na 6 Al 8 Si 8 O 32 (where □ = vacancy), has recently been recognised by the International...
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Image
The Raman spectrum of trinepheline compared to that of nepheline. Comparison of the two spectra clearly shows the minerals to be different. The nepheline reference Raman spectrum (Na0.77K0.23)AlSiO4 (non-oriented sample; 514 nm laser) is from RRUFF database (Downs, 2006); all Raman data together with chemical analyses and X-ray data for this phase are available on the RRUFF website (http://rruff.info/) under RRUFF ID: R040025.

The Raman spectrum of trinepheline compared to that of nepheline. Compariso...

Published: 01 March 2014
Fig. 2 The Raman spectrum of trinepheline compared to that of nepheline. Comparison of the two spectra clearly shows the minerals to be different. The nepheline reference Raman spectrum (Na 0.77 K 0.23 )AlSiO 4 (non-oriented sample; 514 nm laser) is from RRUFF database ( Downs, 2006 ); all Raman
Image
(a) Crystal structure of trinepheline as viewed down c based on the data of Kahlenberg &amp; Böhm (1998); purple circles indicate the Na ions. (b) Projection of the crystal structure of a Na-deficient nepheline parallel to c, based on the data of Hippler &amp; Böhm (1989).

(a) Crystal structure of trinepheline as viewed down c based on the data ...

Published: 01 March 2014
Fig. 5 (a) Crystal structure of trinepheline as viewed down c based on the data of Kahlenberg & Böhm (1998) ; purple circles indicate the Na ions. (b) Projection of the crystal structure of a Na-deficient nepheline parallel to c , based on the data of Hippler & Böhm (1989) .
Image
Three consecutive elliptical layers in the structure of hexagonal trinepheline (Kahlenberg and Böhm 1998) and their skeletal representation: (a) 0.00 ≤ z ≤ 0.24; (b) 0.16 ≤ z ≤ 0.40; (c) 0.32 ≤ z ≤ 0.56.

Three consecutive elliptical layers in the structure of hexagonal trinephel...

Published: 01 July 2008
F igure 3. Three consecutive elliptical layers in the structure of hexagonal trinepheline ( Kahlenberg and Böhm 1998 ) and their skeletal representation: ( a ) 0.00 ≤ z ≤ 0.24; ( b ) 0.16 ≤ z ≤ 0.40; ( c ) 0.32 ≤ z ≤ 0.56.
Image
Diffraction angle range showing asymmetric reflection group “6” as collected (black circles) and the increase of the weight fraction of monoclinic trinepheline (black line) in comparison to Na-nepheline (grey line) with increase of temperature.

Diffraction angle range showing asymmetric reflection group “6” as collecte...

Published: 01 September 2013
Fig. 4 Diffraction angle range showing asymmetric reflection group “6” as collected (black circles) and the increase of the weight fraction of monoclinic trinepheline (black line) in comparison to Na-nepheline (grey line) with increase of temperature.
Image
The basic three building layers of monoclinic trinepheline. Hatched and white tetrahedra correspond to SiO4 and AlO4, respectively. On the right side, skeletal representations are given to outline the positions of tetrahedrally coordinated cations: (a) 0.00 ≤ z ≤ 0.24; (b) 0.16 ≤ z ≤ 0.40; (c) 0.32 ≤ z ≤ 0.56.

The basic three building layers of monoclinic trinepheline. Hatched and whi...

Published: 01 July 2008
F igure 1. The basic three building layers of monoclinic trinepheline. Hatched and white tetrahedra correspond to SiO 4 and AlO 4 , respectively. On the right side, skeletal representations are given to outline the positions of tetrahedrally coordinated cations: ( a ) 0.00 ≤ z ≤ 0.24; ( b
Image
The charge-balanced Ca0.5□0.5–Na–K chemical plot (in at%), where Al8Si8O32 is constant in all the large triangle (modified after Rossi et al., 1989). The dotted purple line delineates the limit of the “small triangle” of the nepheline-structure group. Large grey squares = end-member compositions relevant to the present discussion. Solid lozenge = lisetite (type specimen from Rossi et al., 1986); red triangle = davidsmithite (this work); yellow triangles = four other analyses of davidsmithite from the same locality; blue circle = trinepheline (type specimen from Ferraris et al., 2014); green square = nepheline (representative sample no. 2 on page 478 in Deer et al., 1992). Open circles and small brown dotted lozenge lines: 50:50 boundaries in the compositional space of the nepheline structure, as first suggested by Rossi et al. (1989) and now approved by the IMA along with the new mineral Dvs. In this diagram, fabriesite would plot over trinepheline, but it is a hydrous mineral with a different crystal structure. See text for more details.

The charge-balanced Ca 0.5 □ 0.5 –Na–K chemical plot (in at%), where Al 8 S...

Published: 26 June 2017
-member compositions relevant to the present discussion. Solid lozenge = lisetite (type specimen from Rossi et al. , 1986 ); red triangle = davidsmithite (this work); yellow triangles = four other analyses of davidsmithite from the same locality; blue circle = trinepheline (type specimen from Ferraris
Image
(a) Secondary-electron (SE) image and (b) the corresponding EBSD elemental and crystal-structure reconstructed map showing the presence of fabriesite (fab - yellow) occurring as intergrowths together with nepheline (nph - cyan), natrolite (red), banalsite (ban - white) and trinepheline (tri - blue) after jadeite (jd - green) and albite (ab + holes − black). In the SE image, areas corresponding to fabriesite and other zeolitic products are visibly more damaged by sample surface polishing compared to nepheline, jadeite and albite.

(a) Secondary-electron (SE) image and (b) the corresponding EBSD elemental ...

Published: 01 March 2014
Fig. 1 (a) Secondary-electron (SE) image and (b) the corresponding EBSD elemental and crystal-structure reconstructed map showing the presence of fabriesite (fab - yellow) occurring as intergrowths together with nepheline (nph - cyan), natrolite (red), banalsite (ban - white) and trinepheline
Image
Top: Raman spectra of fabriesite (black) compared to those of natrolite (red) and an epoxy resin present in the polished thin section. Comparison of the three spectra clearly points out the characteristics of fabriesite. Besides typical peaks at low values (&lt; 1800 cm−1) comparable to those of natrolite, fabriesite clearly shows, even if very broad compared to those of natrolite, peaks due to the presence of water centred at around 3200 and 3500 cm−1. The peak centred at about 2900 cm−1 corresponds to a signal due to epoxy resin in the thin polished sections. Bottom: Raman spectra of trinepheline and fabriesite in the 150–1100 cm−1 range.

Top : Raman spectra of fabriesite (black) compared to those of natrolite (r...

Published: 01 March 2014
spectra of trinepheline and fabriesite in the 150–1100 cm −1 range.
Journal Article

New minerals and nomenclature modifications approved in 2012

P. A. Williams, F. Hatert, M. Pasero, S. J. Mills
Published: 01 October 2012
Mineralogical Magazine (2012) 76 (5): 1281–1288.
DOI: https://doi.org/10.1180/minmag.2012.076.5.15
... Trinepheline NaAlSiO 4 Tawmaw, Hpakant-Tawmaw jade tract, Hpakant Township, Mohnyin district, Kachin State, Myanmar G.C. Parodi, S. Pont, C. Ferraris*, B. Rondeau and J.P. Lorand *E-mail: [email protected] Known structure type; known synthetic phase Hexagonal: P 6 1 , P 6 5...
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