Chirvinskyite, (Na,Ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3-(Si2O7)4(OH,O,F)12, a New Mineral with a Modular Wallpaper Structure, from the Khibiny Alkaline Massif (Kola Peninsula, Russia)
Abstract:Chirvinskyite, (Na,Ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3(Si2O7)4(OH,O,F)12, is a new wöhlerite–related zirconotitano–sorosilicate. It is triclinic, P1, a = 7.0477(5), b = 9.8725(5), c = 12.2204(9) Å, α = 77.995(5), β = 82.057(6), γ = 89.988(5)°, V = 823.35(9) Å3, Z = 1. The mineral was found in albitized alkaline pegmatites in a foyaite of the Mt. Takhtarvumchorr (Khibiny alkaline massif, Kola Peninsula, Russia, N 67°40’, E 33°33’). Chirvinskyite forms sheaf–like and radiated aggregates (up to 6 mm in diameter) of s… Show more
“…The same shift was observed previously for natural ivanyukite and corresponded to the transition from rhombohedral to cubic form [27]. The bands in the range of 350-500 cm −1 correspond to symmetric bending vibrations of O-Si-O bonds and overlapping stretching vibrations of Ti-O bonds [25][26][27]. The bands at 498 and 471 cm −1 were assigned to different modes of Ti-O stretching vibrations.…”
Section: Powder Diffractionsupporting
confidence: 83%
“…The Raman spectra of SIV (ivanyukite-Na-T), SIV-Pb, and Pb-exchanged natural ivanyukite are shown in Figure 2. The assignments of the absorption bands were made by analogy with structurally related pharmacosiderite type compounds [23][24][25] and titanosilicates [26][27][28][29].…”
The production of electrolytic nickel includes the stage of leaching of captured firing nickel matte dust. The solutions formed during this process contain considerable amounts of Pb, which is difficult to extraction due to its low concentration upon the high-salt background. The sorption of lead from model solutions with various compositions by synthetic and natural titanosilicate sorbents (synthetic ivanyukite-Na-T (SIV), ivanyukite-Na-T, and AM-4) have been investigated. The maximal sorption capacity of Pb is up to 400 mg/g and was demonstrated by synthetic ivanyukite In solutions with the high content of Cl− (20 g/L), extraction was observed only with a high amount of Na (150 g/L). Molecular mechanisms and kinetics of lead incorporation into ivanyukite were studied by the combination of single-crystal and powder X-ray diffraction, microprobe analysis, and Raman spectroscopy. Incorporation of lead into natural ivanyukite-Na-T with the R3m symmetry by the substitution 2Na+ + 2O2− ↔ Pb2+ + □ + 2OH− leds to its transformation into the cubic P−43m Pb-exchanged form with the empirical formulae Pb1.26[Ti4O2.52(OH)1.48(SiO4)3]·3.32(H2O).
“…The same shift was observed previously for natural ivanyukite and corresponded to the transition from rhombohedral to cubic form [27]. The bands in the range of 350-500 cm −1 correspond to symmetric bending vibrations of O-Si-O bonds and overlapping stretching vibrations of Ti-O bonds [25][26][27]. The bands at 498 and 471 cm −1 were assigned to different modes of Ti-O stretching vibrations.…”
Section: Powder Diffractionsupporting
confidence: 83%
“…The Raman spectra of SIV (ivanyukite-Na-T), SIV-Pb, and Pb-exchanged natural ivanyukite are shown in Figure 2. The assignments of the absorption bands were made by analogy with structurally related pharmacosiderite type compounds [23][24][25] and titanosilicates [26][27][28][29].…”
The production of electrolytic nickel includes the stage of leaching of captured firing nickel matte dust. The solutions formed during this process contain considerable amounts of Pb, which is difficult to extraction due to its low concentration upon the high-salt background. The sorption of lead from model solutions with various compositions by synthetic and natural titanosilicate sorbents (synthetic ivanyukite-Na-T (SIV), ivanyukite-Na-T, and AM-4) have been investigated. The maximal sorption capacity of Pb is up to 400 mg/g and was demonstrated by synthetic ivanyukite In solutions with the high content of Cl− (20 g/L), extraction was observed only with a high amount of Na (150 g/L). Molecular mechanisms and kinetics of lead incorporation into ivanyukite were studied by the combination of single-crystal and powder X-ray diffraction, microprobe analysis, and Raman spectroscopy. Incorporation of lead into natural ivanyukite-Na-T with the R3m symmetry by the substitution 2Na+ + 2O2− ↔ Pb2+ + □ + 2OH− leds to its transformation into the cubic P−43m Pb-exchanged form with the empirical formulae Pb1.26[Ti4O2.52(OH)1.48(SiO4)3]·3.32(H2O).
“…The spectrum of cubic Cu-rich ivanyukite-K is similar to that of pharmacosiderite from Cornwall, England, taken from sample R050574 of the RRUFF project (Lafuente et al , 2015). The assignments of the absorption bands were made by analogy with structurally related pharmacosiderite (Frost and Kloprogge, 2003; Filippi, 2004; Filippi et al , 2007) and titanosilicates (Celestian et al , 2013; Pakhomovsky et al , 2018; Yakovenchuk et al , 2019) and are given in Table 2. Fig.…”
Section: Raman Spectroscopymentioning
confidence: 99%
“…This band also can be due to Cu−O stretching vibrations of mixed Cu−O−Ti stretching vibrations involving a Cu−O3 bond. The bands in the range 350‒500 cm −1 correspond to symmetric bending vibrations of O‒Si‒O bonds and overlapping stretching vibrations of Ti‒O bonds (Filippi et al , 2007; Pakhomovsky et al , 2018; Yakovenchuk et al , 2019). The bands at 460 and 494 cm −1 assigned to different modes of Ti‒O stretching vibrations.…”
“…5) contains an intense band at 1118 cm −1 , which, together with weak bands at 1043 and 999 cm −1 , can be assigned to the Si–O–Si and O–Si–O asymmetric stretching vibrations in the [Si 8 O 20 ] 8− groups. The band at 687 and weak band at 792 cm −1 are related to the symmetric stretching vibrations of the same bonds (Yakovenchuk et al , 2019). The most intense band at 597 cm −1 is related to the asymmetric bending vibrations of Si‒O bonds or overlapping stretching vibrations of Ti‒O bonds (Filippi et al , 2007; Celestian et al , 2013).…”
For this study, the rare Cu-bearing silicate fumarolic assemblages from the Somma-Vesuvius volcano (Italy), characterized by the rare mineral litidionite, CuKNaSi 4 O 10 , were investigated.Recently other Cu-and Ti-bearing phases were found in these associations and here we report new data about these mineralizations, in which Ti-bearing litidionite occurs together with kamenevite, perovskite and rutile. Ti-bearing litidionite appears on the latest stages of partial crystallization of Ti-bearing silica glass. Incorporation of Ti 4+ into litidionite crystal structure was investigated in detail. The Raman spectra of Ti-bearing litidionite contain intense band at 597 cm −1 related to antisymmetric bending vibrations of Si-O bonds or overlapping stretching vibrations of Ti-O bonds. The bands in the range 350-500 cm −1 correspond to symmetric bending vibrations of O-Si-O bonds and overlapping stretching vibrations of Ti-O bonds. The crystal structure of Ti-litidionite has been refined in the P ̅ space group, a = 6.9699(7), b = 7.9953(10), c = 9.8227(10) Å, α = 105.186(9), β = 99.458(8), γ = 114.489(10) to R 1 = 0.064 for 1726 unique observed reflections. The refinement of the site-occupation factors confirmed the presence of Ti at five-coordinated M-site.The mean bond distance of 2.125 Å of M-site agrees with its refined occupancy (Ti 0.32 Cu 0.30 Ca 0.29 Fe 0.09 ) 1.00 . The incorporation of Ti into litidionite structure is accompanied by the complex heteropolyhedral substitution according to the scheme V Ti 4+ + VII-VIII □ + IV Al 3+ ↔ V Cu 2+ + VII-VIII (Na,K) + + IV Si 4+ . Two possible configurations for the phase with maximal TiO 2 content (12.06 wt% or 0.56 Ti apfu) CuTiK□Na 2 Si 7 AlO 20 (Z = 1) or CuTiK 2 Na□Si 7 AlO 20 (Z = 1) have been proposed.
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