TARBAGATAITE, (K, )2(Ca,Na)(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)4(OH,F), A NEW ASTROPHYLLITE-GROUP MINERAL SPECIES FROM THE VERKHNEE ESPE DEPOSIT, AKJAILYAUTAS MOUNTAINS, KAZAKHSTAN: DESCRIPTION AND CRYSTAL STRUCTURE

Степанов, А. В.; Bekenova, G. K.; Levin, V. L.; Sokolova, Elena; Hawthorne, Frank C.; Dobrovol’skaya, Elena A.

doi:10.3749/canmin.50.1.159

Cited by 17 publications

(8 citation statements)

References 15 publications

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“…Later, it was recognized in other occurrences, chiefly from granitic pegmatites of the NYF [Niobium-Yttrium-Fluorine; in the sense of Č erný (1991)] type: the Å skagen pegmatite quarry, Sweden (Sjö gren, 1906;Kristiansen, 1993;Š koda et al, 2012); the Evje-Iveland pegmatite district of southern Norway (Schetelig, 193l;Bjørlykke, 1939;Griffin et al, 1979); the Pyörönmaa pegmatite, Finland (Vorma et al, 1966); the White Cloud and Snowflake pegmatites, Cripple Creek, Colorado, USA (Adams et al, 1962;Adams and Sharp, 1972); the Guy Hazen claim, Arizona, USA (Fitzpatrick and Pabst, 1986); Suishoyama, Iizaka, Kofu, Nosen, Ryoke and Hiroshima, Japan (Nagashima and Kato, 1966;Minakawa et al, 1999). Thalénite-(Y) is also mentioned from the Verkhnee Espe alkaline granite deposit, Akjailyautas Mountains, Kazakhstan (Stepanov et al, 2012) and from the La Cabrera pluton, Spain (González del Tánago et al, 2006) but without any structural or chemical data. Kozireva et al (2004) reported extraordinary light REE (LREE)-to medium REE (MREE)-rich thalénite-(Y) from the Maldynyrd Range, Prepolar Urals, Russia.…”

Section: Introductionmentioning

confidence: 99%

Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities

et al. 2015

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Using type material from the Österby pegmatite in Dalarna, Sweden, the chemical composition and structural parameters of thalénite-(Y) [ideally Y3Si3O10(OH)] were examined by wavelength dispersive spectroscopy electron microprobe (WDS EMP) analysis and single-crystal X-ray diffraction. High contrast back-scatter electron images of the Österby material show at least two generations of thalénite-(Y). The formula of the primary thalénite-(Y) normalized to 11 anions is (Y2.58Dy0.11Yb0.09Gd0.06Er0.06Ho0.02Sm0.02Tb0.02Lu0.02Nd0.01Tm0.01)Σ3.00Si3.01O10F0.97OH0.03. The secondary thalénite-(Y), replacing the primary material, is weakly enhanced in Y and depleted in the lightest and the heaviest rare-earth elements, yielding the formula (Y2.63Dy0.12Yb0.06Gd0.06Er0.05Ho0.02Sm0.02Tb0.02Tm0.01Nd0.01Lu0.01)Σ3.00Si3.01O10F0.98OH0.02. Structural data for thalénite-(Y) from Österby clearly indicate the monoclinic space group P21/n, with a = 7.3464(4), b = 11.1726(5), c = 10.4180(5) Å, β = 97.318(4)°, V = 848.13(7) Å3, Z = 4, which is consistent with previous investigations. The structure was refined from single-crystal X-ray diffraction data to R1 = 0.0371 for 1503 unique observed reflections, and the final chemical composition obtained from the refinement, (Y2.64Dy0.36)Σ3.00F0.987[Si3O10], Z = 4, is in good agreement with the empirical formula resulting from electron microprobe (EMP) analysis. Both techniques reveal a strong dominance of F over OH, which means that the type material actually corresponds to the fluorine analogue. Moreover, new EMP analyses of samples of thalénite-(Y) from an additional seven localities (Åskagen and Reunavare in Sweden; White Cloud and Snow Flake in Colorado, USA; the Guy Hazel claim in Arizona, USA; Suishoyama and Souri in Japan) clearly show the prevalence of F over OH as well. Based on these observations, the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association has recommended a redefinition of the chemical composition of thalénite-(Y) to represent the F-dominant species with the ideal formula Y3Si3O10F, as it has historical priority. Consequently, the later described fluorthalénite-(Y) has to be discredited.

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Section: Introductionmentioning

confidence: 99%

Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities

et al. 2015

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“…Minerals of the astrophyllite group are found mainly in alkaline intrusions (Piilonen et al 2003a). To date, the astrophyllite supergroup consists of three mineral groups and includes 12 minerals (Sokolova et al 2017a): astrophyllite (Weibye 1848; Woodrow 1967;Piilonen et al 2003a, b), niobophyllite (Nickel et al 1964;Cámara et al 2010), zircophyllite (Kapustin 1972(Kapustin , 1973Sokolova and Hawthorne 2016), tarbagataite (Stepanov et al 2012), nalivkinite (Agakhanov et al 2008(Agakhanov et al , 2016Uvarova et al 2008), bulgakite (Agakhanov et al 2016), kupletskite (Semenov 1956;Piilonen et al 2001;Piilonen et al 2006), niobokupletskite (Piilonen et al 2000), kupletskite-(Cs) (Yefimov et al 1971;Bayliss 2007;Cámara et al 2010), devitoite (Kampf et al 2010), sveinbergeite (Khomyakov et al 2011), and lobanovite (former "magnesioastrophyllite") (Shi et al 1998;Sokolova and Cámara 2008;Sokolova et al 2017b).…”

Section: +mentioning

confidence: 99%

High-temperature behaviour of astrophyllite, K2NaFe7 2+Ti2(Si4O12)2O2(OH)4F: a combined X-ray diffraction and Mössbauer spectroscopic study

et al. 2017

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Å 3 for the HT (annealed) modification of astrophyllite. The oxidation of iron is confirmed: (1) by the presence of an exothermic effect at 584 °C in the DTA/TG curves in an Ar-O atmosphere and its absence in an Ar-Ar atmosphere and (2) by ex situ Mössbauer spectroscopy that showed the oxidation of Fe 2+ to Fe 3+ in the samples heated to 700 °C. Deprotonation was detected by the evolution of IR spectra in the region 3600-3000 cm −1 for astrophyllite and its HT modification. Defluorination was detected by the presence of F in the electron microprobe analysis of unheated astrophyllite and the absence of F in the analysis of unpolished heated astrophyllite. The significant difference between astrophyllite and its HT modification is in the reduction of the M-O interatomic distances after heating to 500 °C and the distortion indices of the MO 6 and Dφ 6 octahedra. Thermal behaviour of astrophyllite in the 25-475 °C temperature range can be described as a volume thermal expansion with maximal coefficient of thermal expansion in the direction perpendicular to the plane of the HOH layers. In contrast, the HT phase experiences a strong contraction in the 600-775 °C temperature range, again in the direction perpendicular to the plane of the HOH layers.

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“…There are plenty of crystalchemical data on heterophyllosilicates at room temperature (see e.g. Sokolova, 2006;Ferraris et al, 2008;Cá mara et al, 2010;Stepanov et al, 2012;Agakhanov et al, 2016;Sokolova & Hawthorne, 2016;Jin et al, 2018;Sokolova et al, 2018), but the same cannot be said of their behaviour at non-ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

High-temperature Fe oxidation coupled with redistribution of framework cations in lobanovite, K₂Na(Fe²⁺₄Mg₂Na)Ti₂(Si₄O₁₂)₂O₂(OH)₄– the first titanosilicate case

Zhitova

Zolotarev

Hawthorne

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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OH) 4 , was studied using in situ powder X-ray diffraction in the temperature range 25-1000 C and ex situ single-crystal X-ray diffraction of 17 crystals quenched from different temperatures. HT iron oxidation associated with dehydroxylation starts at 450 C, similar to other ferrous-hydroxy-rich heterophyllosilicates such as astrophyllite and bafertisite. A prominent feature of lobanovite HT crystal chemistry is the redistribution of Fe and Mg+Mn cations over the M(2), M(3), M(4) sites of the octahedral (O) layer that accompanies iron oxidation and dehydroxylation. This HT redistribution of cations has not been observed in titanosilicates until now, and seems to be triggered by the need to maintain bond strengths at the apical oxygen atom of the TiO 5 pyramid in the heteropolyhedral (H) layer during oxidationdehydroxylation. Comparison of the HT behaviour of lobanovite with fivecoordinated Ti and astrophyllite with six-coordinated Ti shows that the geometry of the Ti polyhedron plays a key role in the HT behaviour of heterophyllosilicates. The thermal expansion, geometrical changes and redistribution of site occupancies which occur in lobanovite under increasing temperature are reported. A brief discussion is given of minerals in which the cation ordering (usually for Fe and Mg) occurs together with iron oxidationdehydroxylation at elevated temperatures: micas, amphiboles and tourmalines. Now this list is expanded by the inclusion of titanosilicate minerals.

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TARBAGATAITE, (K, )2(Ca,Na)(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)4(OH,F), A NEW ASTROPHYLLITE-GROUP MINERAL SPECIES FROM THE VERKHNEE ESPE DEPOSIT, AKJAILYAUTAS MOUNTAINS, KAZAKHSTAN: DESCRIPTION AND CRYSTAL STRUCTURE

Cited by 17 publications

References 15 publications

Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities

Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities

High-temperature behaviour of astrophyllite, K2NaFe7 2+Ti2(Si4O12)2O2(OH)4F: a combined X-ray diffraction and Mössbauer spectroscopic study

High-temperature Fe oxidation coupled with redistribution of framework cations in lobanovite, K₂Na(Fe²⁺₄Mg₂Na)Ti₂(Si₄O₁₂)₂O₂(OH)₄– the first titanosilicate case

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TARBAGATAITE, (K, )2(Ca,Na)(Fe2+,Mn)7Ti2(Si4O12)2O2(OH)4(OH,F), A NEW ASTROPHYLLITE-GROUP MINERAL SPECIES FROM THE VERKHNEE ESPE DEPOSIT, AKJAILYAUTAS MOUNTAINS, KAZAKHSTAN: DESCRIPTION AND CRYSTAL STRUCTURE

Cited by 17 publications

References 15 publications

Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities

Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities

High-temperature behaviour of astrophyllite, K2NaFe7 2+Ti2(Si4O12)2O2(OH)4F: a combined X-ray diffraction and Mössbauer spectroscopic study

High-temperature Fe oxidation coupled with redistribution of framework cations in lobanovite, K2Na(Fe2+4Mg2Na)Ti2(Si4O12)2O2(OH)4– the first titanosilicate case

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High-temperature Fe oxidation coupled with redistribution of framework cations in lobanovite, K₂Na(Fe²⁺₄Mg₂Na)Ti₂(Si₄O₁₂)₂O₂(OH)₄– the first titanosilicate case