ChemInform Abstract: BROMINATION OF 1‐VINYLPYRAZOLES

Еськова, Л. А.; Domnina, E. S.; Skvortsova, G. G.; Воронов, В. К.; Chípanina, N. N.; Kazakova, N. A.

doi:10.1002/chin.197849213

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“…Selected interatomic distances (Å ) and angles (º) for noonkanbahite. (1954( ), Uvarova et al (2003 first described by Nikitin and Belov (1962). Tidominant (Mj 6 ) octahedra link via common vertices to form a perovskite-like (Mj 5 ) 6À chain.…”

Section: Topology Of the Structurementioning

confidence: 99%

Noonkanbahite, BaKNaTi₂(Si₄O₁₂)O₂, a new mineral species: description and crystal structure

Uvarova¹,

Sokolova²,

Hawthorne³

et al. 2010

Mineral. mag.

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Noonkanbahite, ideally BaKNaTi2(Si4O12)O2, is described as a new mineral species. At Liley [Löhley], Eifel Mountains, Germany (the holotype locality), it occurs as sprays of prismatic crystals (up to 8 mm) or single prismatic crystals (up to 4 mm) on walls of cavities in alkaline igneous rocks. At Murun, Siberia, Russia, noonkanbahite forms coarse lamellar crystals up to 0.05 cm × 0.7 cm × 1.5 cm embedded in kalsilite syenite. Noonkanbahite is brittle, H = 6, Dobs. = 3.39(1), Dcalc. = 3.49 g/cm3, has a vitreous lustre and does not fluoresce in ultraviolet light. It has poor cleavage on {010} and {100} and weak parting on {011}. Noonkanbahite is biaxial positive with 2Vobs. = 75(2)°, 2Vcalc. = 72.7(9)°, α 1.730(5), β 1.740(5) and γ 1.765(5), dispersion is medium, r < v. In transmitted plane-polarized light, noonkanbahite is strongly pleochroic, with X colourless, Y yellowish, Z straw-yellow; X = a, Y = b, Z = c. Noonkanbahite is orthorhombic, space group Imma, a = 8.0884(4), b = 10.4970(5), c = 13.9372(6) Å, V = 1183.3(1) Å3, Z = 4. The strongest ten X-ray diffraction lines in the powder pattern [d in Å (I)(hkl)] are: 2.907(100)(222), 8.353(50)(001), 3.196(50)(220), 2.097(50)(242), 2.241(40)(215), 2.179(40)(035), 3.377(30)(031), 2.694(30)(015), 2.304(30)(233), and 1.564(30)(064). Electron microprobe analysis gives SiO2 37.82, TiO2 15.54, ZrO2 0.42, Nb2O5 3.18, Al2O3 0.17, Fe2O3 (recalculated from FeO) 5.63, MnO 0.32, MgO 0.53, BaO 20.60, CaO 1.36, K2O 5.32, Na2O 6.14, F 0.78, H2O 0.58, sum 98.39 wt.%, (H2O determined by SIMS). The formula unit, calculated on the basis of 14 anions (O+OH+F), is (Ba0.85K0.13)Σ0.98(K0.59Na0.26Ca0.15)Σ1.00Na(Ti1.23Fe0.453+Nb0.15Mg0.08Mn0.03Zr0.02Al0.01)Σ1.97 (Si3.99Al0.01O12)(O1.33OH0.41F0.26)Σ2.00, Z = 4.The crystal structure was refined to R1 = 2.8% for 970 unique (F0 > 4σF) reflections collected on a Bruker single-crystal P4 diffractometer with a CCD detector and MoKα X-radiation. The crystal structure of noonkanbahite is isostructural with that of batisite, ideally BaNa2Ti2(Si4O12)O2, and scherbakovite, ideally K2NaTi2(Si4O12)O(OH). There are two octahedrally coordinated sites, M(1) and M(2), occupied by (Ti1.23Fe0.453+Nb0.15Mg0.08Mn0.03Zr0.02Al0.01), ideally Ti2 a.p.f.u. There are three interstitial A sites, [9]A(1), [8]A(2) and [6]A(3), occupied by Ba, K and Na, respectively. Si tetrahedra and M octahedra form a framework with interstitial cages occupied by Ba, K and Na atoms at the A sites. Noonkanbahite, BaKNaTi2(Si4O12)O2, is a K analogue of batisite, BaNa2Ti2(Si4O12)O2, and a Ba analogue of shcherbakovite, K2NaTi2(Si4O12)O(OH).

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Section: Topology Of the Structurementioning

confidence: 99%

Noonkanbahite, BaKNaTi₂(Si₄O₁₂)O₂, a new mineral species: description and crystal structure

Uvarova¹,

Sokolova²,

Hawthorne³

et al. 2010

Mineral. mag.

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ChemInform Abstract: BROMINATION OF 1‐VINYLPYRAZOLES

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Noonkanbahite, BaKNaTi₂(Si₄O₁₂)O₂, a new mineral species: description and crystal structure

Noonkanbahite, BaKNaTi₂(Si₄O₁₂)O₂, a new mineral species: description and crystal structure

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ChemInform Abstract: BROMINATION OF 1‐VINYLPYRAZOLES

Cited by 1 publication

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Noonkanbahite, BaKNaTi2(Si4O12)O2, a new mineral species: description and crystal structure

Noonkanbahite, BaKNaTi2(Si4O12)O2, a new mineral species: description and crystal structure

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Noonkanbahite, BaKNaTi₂(Si₄O₁₂)O₂, a new mineral species: description and crystal structure

Noonkanbahite, BaKNaTi₂(Si₄O₁₂)O₂, a new mineral species: description and crystal structure