The crystal structure of Na2Mg2Si6O15

Cradwick, M. E.; Taylor, H. F. W.

doi:10.1107/s0567740872008374

Cited by 24 publications

(5 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These phases are closely related structurally to Na2Mg2Si6015 (Cradwick and Taylor, 1972), tuhualite, (Na,K)2Fe ~ § § . H20 (Merlino, 1969), and emeleusite, Na2LiFeSi601 s (Upton et al, 1978).…”

Section: Synthesis Of Li2zrsi6015 a Zektzerite-related Phasementioning

confidence: 86%

“…CONSIDERABLE recent interest has been shown in a group of double-chain silicate phases which includes the new mineral zektzerite, LiNaZrSi6015 (Dunn et al, 1977;Ghose and Wan, 1978), and a family of isotypic phases (Marr and Glasser, 1979a and b). These phases are closely related structurally to Na2Mg2Si6015 (Cradwick and Taylor, 1972), tuhualite, (Na,K)2Fe ~ § § . H20 (Merlino, 1969), and emeleusite, Na2LiFeSi601 s (Upton et al, 1978).…”

Section: Synthesis Of Li2zrsi6015 a Zektzerite-related Phasementioning

confidence: 86%

See 1 more Smart Citation

Synthesis of Li₂ZrSi₆O₁₅, a zektzerite-related phase

Quintana¹

1981

Mineral. mag.

View full text Add to dashboard Cite

Considerable recent interest has been shown in a group of double-chain silicate phases which includes the new mineral zektzerite, LiNaZrSi6O15 (Dunn et al., 1977; Ghose and Wan, 1978), and a family of isotypic phases (Marr and Glasser, 1979a and b). These phases are closely related structurally to Na2Mg2Si6O15 (Cradwick and Taylor, 1972), tuhualite, (Na,K)2Fe2+2Fe3+2Si12O30.H2O (Merlino, 1969), and emeleusite, Na2LiFeSi6O15 (Upton et al., 1978).

show abstract

Section: Synthesis Of Li2zrsi6015 a Zektzerite-related Phasementioning

confidence: 86%

Section: Synthesis Of Li2zrsi6015 a Zektzerite-related Phasementioning

confidence: 86%

Synthesis of Li₂ZrSi₆O₁₅, a zektzerite-related phase

Quintana¹

1981

Mineral. mag.

View full text Add to dashboard Cite

show abstract

“…At room temperature, the structure refinement was carried out with full occupancy of the Na(1) site, while the Na(2) site was kept vacant. The positional coordinates of the Na(2) site were fixed at x = 0.0, y = 0.4099, z = 0.2568 as reported in Na 2 Mg 2 Si 6 O 15 structure (Cradwick and Taylor 1972). From 773 to 1223 K, positional coordinates of Na(2) were kept constant and both the Na(1) and Na(2) occupancies were refined, keeping the total occupancy at 1.0.…”

Section: Methodsmentioning

confidence: 99%

“…Zektzerite is isostructural with tuhualite (Merlino 1969) and synthetic Na 2 Mg 2 Si 6 O 15 (Cradwick and Taylor 1972). The coordination of Na in the occupied Na(1) position, the angular distortion in tetrahedra and the configuration of the Si tetrahedral volume (filled square), bond angle variance (filled circle) and quadratic elongation (filled triangle) as a function of temperature.…”

Section: The Na(2) Polyhedronmentioning

confidence: 99%

A first-order phase transition in zektzerite, NaLiZrSi6O15: high-temperature single-crystal X-ray diffraction study

Shaikh

Ghose

2015

Phys Chem Minerals

View full text Add to dashboard Cite

show abstract

“…However, the [Si 6 O 15 ] unit in these minerals is a silicate double-chain of the Sechser-Doppelkette type (Liebau 1985). An [SiO 3 ] chain of corner-sharing tetrahedra connects to an identical chain across a mirror plane by sharing corners (Ghose & Wan 1978) (Cradwick & Taylor 1972).…”

Section: Moskvinite-(y)mentioning

confidence: 99%

THE CRYSTAL STRUCTURE OF MOSKVINITE-(Y), Na2 K (Y,REE) [Si6O15], A NEW SILICATE MINERAL WITH [Si6O15] THREE-MEMBERED DOUBLE RINGS FROM THE DARA-I-PIOZ MORAINE, TIEN-SHAN MOUNTAINS, TAJIKISTAN

Sokolova

Hawthorne

Agakhanov

et al. 2003

The Canadian Mineralogist

View full text Add to dashboard Cite

The crystal structure of moskvinite-(Y), ideally Na 2 K (Y,REE) [Si 6 O 15 ], from the moraine of the Dara-i-Pioz glacier, the Alai mountain range, Tien-Shan mountains, northern Tajikistan, a 10.623(2), b 14.970(2), c 8.553(1) Å, V 1359.8(4) Å 3 , space group Ibmm, Z = 4, D (calc.) = 2.850 g.cm -3 , has been solved by direct methods and refined to an R 1 index of 1. 7% based on 936 observed [| F o | > 4F] unique reflections collected with single-crystal diffractometer with MoK␣ X-radiation. Electron-microprobe analysis gave the composition Na 2.06 K 0.95 (Y 0.77 Dy 0.09 Gd 0.04 Er 0.04 Ho 0.02 Sm 0.02 Nd 0.01 Tb 0.01 ) ⌺1.00 Si 6 O 15 based on 15 O apfu. In the crystal structure of Na 2 K (Y,REE) [Si 6 O 15 ], there are two tetrahedrally coordinated T sites occupied by Si with = 1.623 Å. The (SiO 4 ) tetrahedra form three-membered rings, [Si 3 O 9 ], that link by sharing apical vertices to form a doublering of the form [Si 6 O 15 ]. There are two [6]-coordinated sites, one occupied by (Y 0.77 + REE 0.23 ) with <(Y,REE)-O> = 2.255 Å, and the other occupied by Na with = 2.438 Å. There is a [10]-coordinated site occupied by K with = 3.062 Å. The {(Y,REE)O 6 } and (NaO 6 ) octahedra share common edges to form sheets parallel to (010); these sheets connect through [Si 6 O 15 ] double-rings to form a framework. Channels extend along [001] and contain K. The topology of the Na 2 K Y [Si 6 O 15 ] framework is identical to that of synthetic Na 3 Y [Si 6 O 15 ], but the arrangement of the channel cations is different. The crystal structures of double-ring silicates and [Si 6 O 18 ]-chain structures are discussed. Keywords: moskvinite-(Y), Y-silicate, crystal structure, [Si 6 O 15 ] double ring, Dara-i-Pioz, Tajikistan. SOMMAIRENous avons résolu la structure cristalline de la moskvinite-(Y), dont la composition idéale est Na 2 K (Y,REE) [Si 6 O 15 ], provenant d'une moraine du glacier Dara-i-Pioz, dans la chaîne Alai des montagnes Tien-Shan, dans le nord du Tajikistan, a 10.623(2), b 14.970(2), c 8.553(1) Å, V 1359.8(4) Å 3 , groupe spatial Ibmm, Z = 4, D (calc.) = 2.850 g.cm -3 , par méthodes directes; la structure a été affinée jusqu'à un résidu R 1 de 1.7% en utilisant 936 réflexions uniques observées [| F o | > 4F], prélevées avec un diffractomètre pour monocristal et un rayonnement MoK␣. Une analyse à la microsonde électronique a donné Na 2.06 K 0.95 (Y 0.77 Dy 0.09 Gd 0.04 Er 0.04 Ho 0.02 Sm 0.02 Nd 0.01 Tb 0.01 ) ⌺1.00 Si 6 O 15 sur une base de 15 atomes d'oxygène par unité formulaire. La structure de Na 2 K (Y,REE) [Si 6 O 15 ] contient deux sites T à coordinence tétraédrique qu'occupe le Si, avec = 1.623 Å. Les tétraèdres (SiO 4 ) sont agencés en anneaux à trois membres, [Si 3 O 9 ], liés par partage de vertex apical pour former un anneau double [Si 6 O 15 ]. Il y a deux sites à coordinence [6]; l'un d'eux contient (Y 0.77 + REE 0.23 ), avec <(Y,REE)-O> = 2.255 Å, et l'autre contient le Na, avec = 2.438 Å. Il y a de plus un site à coordinence [10] qu'occupe le K, avec = 3.06...

show abstract

The crystal structure of Na₂Mg₂Si₆O₁₅

Cited by 24 publications

References 1 publication

Synthesis of Li₂ZrSi₆O₁₅, a zektzerite-related phase

Synthesis of Li₂ZrSi₆O₁₅, a zektzerite-related phase

A first-order phase transition in zektzerite, NaLiZrSi6O15: high-temperature single-crystal X-ray diffraction study

THE CRYSTAL STRUCTURE OF MOSKVINITE-(Y), Na2 K (Y,REE) [Si6O15], A NEW SILICATE MINERAL WITH [Si6O15] THREE-MEMBERED DOUBLE RINGS FROM THE DARA-I-PIOZ MORAINE, TIEN-SHAN MOUNTAINS, TAJIKISTAN

Contact Info

Product

Resources

About

The crystal structure of Na2Mg2Si6O15

Cited by 24 publications

References 1 publication

Synthesis of Li2ZrSi6O15, a zektzerite-related phase

Synthesis of Li2ZrSi6O15, a zektzerite-related phase

A first-order phase transition in zektzerite, NaLiZrSi6O15: high-temperature single-crystal X-ray diffraction study

THE CRYSTAL STRUCTURE OF MOSKVINITE-(Y), Na2 K (Y,REE) [Si6O15], A NEW SILICATE MINERAL WITH [Si6O15] THREE-MEMBERED DOUBLE RINGS FROM THE DARA-I-PIOZ MORAINE, TIEN-SHAN MOUNTAINS, TAJIKISTAN

Contact Info

Product

Resources

About

The crystal structure of Na₂Mg₂Si₆O₁₅

Synthesis of Li₂ZrSi₆O₁₅, a zektzerite-related phase

Synthesis of Li₂ZrSi₆O₁₅, a zektzerite-related phase