Crystal Chemistry of Cancrinite-Group Minerals With an Ab-Type Framework: A Review and New Data. I. Chemical and Structural Variations

Pekov, Igor V.; Olysych, L. V.; Чуканов, Н. В.; Zubkova, N. V.; Pushcharovsky, Dmitry Yu.; Ван, К. В.; Giester, Gerald; Тиллманнс, Е.

doi:10.3749/canmin.49.5.1129

Cited by 50 publications

(38 citation statements)

References 18 publications

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“…and 1440 cm À1 . The peak between 840 and 880 cm À1 is typically observed in CO 3 2À bearing cancrinite, 62 and the CO 3 2À band~1450 cm À1 region has been shown in hydrothermally grown sodalite. 20,63 This suggests that there may be a small fraction of cancrinite phase in the samples.…”

Section: Chemistry Of Sodalitementioning

confidence: 99%

Synthesis and characterization of iodosodalite

et al. 2017

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The effects of six process variables were investigated on the hydrothermal growth of iodosodalite, Na8Al6Si6O24I2: pH (NaOH concentration), aging time, temperature, Al/Si ratio, precursors used (i.e., zeolite 4A, kaolinite, meta‐kaolin, colloidal silica, and sodium aluminate), and precursor concentration. Powder X‐ray diffraction (XRD) with Rietveld refinements, X‐ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were performed to characterize the structures, phase fractions, chemical state, and surface morphology of the synthesized products. Iodosodalite yield increased as aging time and pH increased. The crystallization of iodosodalite was favored in the temperature range 140°C‐180°C. Decreasing the Al/Si ratio by half increased the crystallization of basic cancrinite. Lowering the precursor concentration by adding water revealed the crystallization of nepheline hydrate I and a decrease in the sodalite fraction. Among the tested precursors, zeolite 4A yielded the highest mass fraction of iodosodalite in the synthesized powders. From the aging time and temperature variation experiments, the phase transformation of zeolite A→sodalite→cancrinite was observed. XPS and FTIR results showed the presence of only iodide but not iodate in the synthesized product. The crystallization of various minerals suggests that mechanisms for transport of the ions and formation of the aluminosilicate frameworks vary with hydrothermal conditions.

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Section: Chemistry Of Sodalitementioning

confidence: 99%

Synthesis and characterization of iodosodalite

et al. 2017

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“…The cancrinite group of minerals (Deer et al 2004, Bonaccorsi & Merlino 2005, Pekov et al 2011 are feldspathoids with tectoaluminosilicate frameworks consisting of layers of six-membered rings of tetrahedra perpendicular to the c-axis. Each layer has rings centered on three-or sixfold axes at ( 1 / 3 , 2 / 3 , z) (type A), ( 2 / 3 , 1 / 3 , z) (type B), or (0, 0, z) (type C).…”

Section: The Cancrinite-ab Structurementioning

confidence: 99%

“…A small amount of OH may substitute at the Φ i position, as suggested by Kolitsch et al (2002), locally lengthening the T i -Φ i bond and shortening the M H1 -Φ i bond. This small amount may increase with between the wide channels can increase the unit cell, multiplying a by √3 as in microsommite and pitiglianoite or by 2 as in quadridavyne (Bonaccorsi & Merlino 2005, Pekov et al 2011.…”

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confidence: 99%

Structure and Topology of Dumortierite and Dumortierite-Like Materials

Evans

Groat

2012

The Canadian Mineralogist

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Dumortierite, ca. (Al,)Al 6 (BO 3)Si 3 O 13 (O,OH) 2 , has a complex and unusual crystal structure that is shared by several minerals and an increasing number of synthetic materials, which we group together as dumortierite-like materials (DLMs). Dumortierite has a strongly pseudo-hexagonal orthorhombic structure based on rod-like double-chains of Al octahedra in a framework based on the {6•4•3•4} semi-regular planar tiling. The large hexagonal channels contain chains of face-sharing Al octahedra attached to the framework by rings of SiO 4 tetrahedra. Smaller triangular channels contain planar BO 3 groups, while in other materials the triangular channels are occupied by tetrahedral or pyramidal groups. Holtite and magnesiodumortierite are isostructural with dumortierite, while ellenbergerite, phosphoellenbergerite, ekatite, and the synthetic materials have very similar structures to dumortierite, but with hexagonal symmetry. These minerals and materials differ from one another in the identity of the metal cations occupying the framework and face-sharing chains, and in the tetrahedral, pyramidal, or triangular groups within the hexagonal and triangular channels. We write the following structure-generating function, which describes both topological and stoichiometric properties of DLMs: X(M 2 Φ) 3 (T h Q h 3 q h) 3 (T t Q t 3 q t) where X is the face-sharing hexagonal channel octahedrally coordinated site, M is the framework octahedrally coordinated site, T h and T t are three-to four-coordinate cation sites in the hexagonal and triangular channels, Φ is a four-coordinate anion site, Q h and Q t are three-coordinate basal anion sites, and q h and q t are one-to three-coordinate apical anion sites. We discuss various structural and crystal chemical properties of DLMs, illustrating their commonalities as variations on the theme described by the structure-generating function. We also discuss three closely related structures which involve modifications of different geometrical or topological aspects of the DLM structure: the structure of lyonsite and its synthetic analogues, the structure of satterlyite and holtedahlite, and the structure of the AB polytype of the cancrinite group of feldspathoids.

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“…The host dike, measuring ~2-3 m in width and 20 m in length, comprises aegirine, potassium feldspar, K-Sr-bearing eudialyte, vladykinite, lamprophyllite, nepheline, strontianite, and K-rich vishnevite, listed approximately in order of decreasing modal abundance (for formulas, see Appendix 1 1 online). Note that the cancrinite-group phase tentatively identified here as vishnevite is stoichiometrically close to pitiglianoite, Na 6 K 2 Si 6 Al 6 O 24 (SO 4 )·2H 2 O; the two minerals can be distinguished only on the basis of structural data (Pekov et al 2011), which are currently unavailable. In the Maly Murun lujavrite, vladykinite is relatively abundant, locally composing up to 5% of its volume.…”

Section: Geological Provenance and Paragenesismentioning

confidence: 98%

Vladykinite, Na3Sr4(Fe2+Fe3+)Si8O24: A new complex sheet silicate from peralkaline rocks of the Murun complex, eastern Siberia, Russia

Chakhmouradian

Cooper

Ball

et al. 2014

American Mineralogist

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Vladykinite, ideally Na 3 Sr 4 (Fe 2+ Fe 3+ )Si 8 O 24 , is a new complex sheet silicate occurring as abundant prismatic crystals in a dike of coarse-grained peralkaline feldspathoid syenite in the north-central part of the Murun complex in eastern Siberia, Russia (Lat. 58° 22′ 48″ N; Long. 119° 03′ 44″ E). The new mineral is an early magmatic phase associated with aegirine, potassium feldspar, eudialyte, lamprophyllite, and nepheline; strontianite (as pseudomorphs after vladykinite) and K-rich vishnevite are found in the same assemblage, but represent products of late hydrothermal reworking. Vladykinite is brittle, has a Mohs hardness of 5, and distinct cleavage on {100}. In thin section, it is colorless, biaxial negative [a = 1.624(2), b = 1.652(2), g = 1.657(2), 2V meas = 44(1)°, 2V calc = 45(1)°] and shows an optic orientation consistent with its structural characteristics (X^a = 5.1° in b obtuse, Z^c = 4.7° in b acute, Y = b). The Raman spectrum of vladykinite consists of the following vibration modes (listed in order of decreasing intensity): 401, 203, 465, 991, 968, 915, 348, 167, 129, 264, 1039, and 681 cm -1 ; O-H signals were not detected. The Mössbauer spectrum indicates that both Fe 2+ and Fe 3+ are present in the mineral (Fe 3+ /Fe S = 0.47), and that both cations occur in a tetrahedral coordination. The mean chemical composition of vladykinite (acquired by wavelength-dispersive X-ray spectrometry and laser-ablation inductively-coupled-plasma mass-spectrometry), with Fe S recast into Fe 2+ and Fe 3+ in accord with the Mössbauer data, gives the following empirical formula calculated to 24 O atoms: (Na 2.. The mineral is monoclinic, space group P2 1 /c, a = 5.21381(13), b = 7.9143(2), c = 26.0888(7) Å, b = 90.3556(7)°, V = 1076.50(5) Å 3 , Z = 2. The ten strongest lines in the powder X-ray diffraction pattern are [d obs in Å (I) (hkl)]: 2.957 ((25) (034); 1.785 (25) (21.10, 234). The structure of vladykinite, refined by single-crystal techniques on the basis of 3032 reflections with F o > 4sF o to R 1 = 1.6%, consists of tetrahedral sheets parallel to (100) and consisting of (Si 8 O 24 ) 16-units incorporating four-membered silicate rings and joined into five-and eight-membered rings by sharing vertices with larger tetrahedra hosting Fe 2+ , Fe 3+ , Mn, Zn, Al, Mg, and Ti. Larger cations (predominantly Na, Sr, and Ca) are accommodated in octahedral and square-antiprismatic interlayer sites sandwiched between the tetrahedral sheets. Structural relations between vladykinite and other sheet silicates incorporating four-, five-, and eight-membered rings are discussed. The name vladykinite is in honor of Nikolay V. Vladykin (Vinogradov Institute of Geochemistry, Russia), in recognition of his contribution to the study of alkaline rocks. Holotype and co-type specimens of the mineral were deposited in the Robert B. Ferguson Museum of Mineralogy in Winnipeg, Canada.

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Crystal Chemistry of Cancrinite-Group Minerals With an Ab-Type Framework: A Review and New Data. I. Chemical and Structural Variations

Cited by 50 publications

References 18 publications

Synthesis and characterization of iodosodalite

Synthesis and characterization of iodosodalite

Structure and Topology of Dumortierite and Dumortierite-Like Materials

Vladykinite, Na3Sr4(Fe2+Fe3+)Si8O24: A new complex sheet silicate from peralkaline rocks of the Murun complex, eastern Siberia, Russia

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