Crystal-Chemical Features of Rare and Complex Silicates from Charoite Rocks of the Malyy Murun Volcano-Plutonic Alkaline Complex

Канева, Е. В.; Shendrik, R. Yu.; Vladykin, N. V.; Radomskaya, T. A.

doi:10.1007/978-3-030-69670-2_8

Cited by 3 publications

(2 citation statements)

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“…It is important to understand that in order to create such relevant modern materials, the widest possible knowledge of the compounds used is necessary. Recently, Kaneva et al (2021) [33] made the first attempt to study the vibrational properties of this mineral. However, the data are only descriptive.…”

Section: Introductionmentioning

confidence: 99%

Frankamenite: Relationship between the Crystal–Chemical and Vibrational Properties

Kaneva,

Shendrik,

Pankrushina

et al. 2023

Minerals

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The study provides novel insights into the crystal–chemical and optical characteristics of frankamenite. Frankamenite belongs to a special group (canasite group) of the complex alkaline Ca-(K)-(Na) silicates, and it was found in charoitites from the only known location, Murun Massif, Eastern Siberia, Russia. The crystal–chemical, vibrational, and optical properties of frankamenite were investigated by combining electron probe microanalysis (EPMA), single-crystal X-ray diffraction (SCXRD), infrared (IR) absorption, Raman, UV-Visible absorption, and electron spin resonance (ESR) spectroscopy. The behavior of the peaks in the IR spectra was also studied using ab initio calculations. Detailed characteristics of the internal composition and structure of the mineral species were described, and vibrational and optical properties based on these peculiarities were interpreted. The thermally stimulated reorientation of the H2O molecules and OH− groups was studied by thermo-Raman spectroscopy. Octahedral cationic positions can be readily doped with transition metal and lanthanide ions that provide a promising opportunity to adjust the Ce3+ luminescence. Hence, frankamenite is a potential material for ion exchange, novel phosphors, and luminophores.

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Section: Introductionmentioning

confidence: 99%

Frankamenite: Relationship between the Crystal–Chemical and Vibrational Properties

Kaneva,

Shendrik,

Pankrushina

et al. 2023

Minerals

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“…Results from electron probe microanalysis (EPMA), differential thermal analysis (DTA), thermogravimetry (TG) and derivative thermogravimetry (DTG) are also reported. This work follows other papers aimed at gaining insights on the crystal chemistry (Kaneva et al ., 2014, 2018, 2020b, 2021, 2022, 2023a, 2023b; Mesto et al ., 2014; Lacalamita et al ., 2017; Schingaro et al ., 2017; Lacalamita, 2018; Bogdanov et al ., 2021; Kaneva and Shendrik, 2022) as well as on the structural modifications of some rare minerals from Russian alkaline rocks under non-ambient conditions (Schingaro et al , 2018; Comboni et al , 2019; Lacalamita et al , 2019).…”

Section: Introductionmentioning

confidence: 99%

High-temperature behaviour of fedorite, Na_2.5(Ca_4.5Na_2.5)[Si₁₆O₃₈]F₂⋅2.8H₂O, from the Murun Alkaline Complex, Russia

Lacalamita

Mesto

Канева

et al. 2023

MinMag

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The thermal behaviour of fedorite from the Murun massif, Russia, has been investigated by means of electron probe microanalysis (EPMA), differential thermal analysis (DTA), thermogravimetry (TG), in situ high-temperature single-crystal X-ray diffraction (HT-SCXRD), ex situ high-temperature Fourier-transform infrared spectroscopy (HT-FTIR). The empirical chemical formula of the sample of fedorite studied is: (Na1.56K0.72Sr0.12)Σ2.40(Ca4.42Na2.54Mn0.02Fe0.01Mg0.01)Σ7.00(Si15.98Al0.02)Σ16.00(F1.92Cl0.09)Σ2.01(O37.93OH0.07)Σ38.00⋅2.8H2O. The TG curve provides a total mass decrease of ~5.5%, associated with dehydration and defluorination processes from 25 to 1050°C. Fedorite crystallises in space group P $\bar{1}$ and has: a = 9.6458(2), b = 9.6521(2), c = 12.6202(4) Å, α = 102.458(2), β = 96.2250(10), γ = 119.9020(10)° and cell volume, V = 961.69(5) Å3. The HT-SCXRD was carried out in air in the 25–600°C range. Overall, a continuous expansion of the unit-cell volume was observed although the c cell dimension slightly decreases in the explored temperature range. Structure refinements indicated that the mineral undergoes a dehydration process with the loss of most of the interlayer H2O from 25 to 300°C. The HT-FTIR spectra confirmed that fedorite progressively dehydrates until 700°C.

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Geochemistry of Ca-(K)-(Na) silicates from charoitites in the Sirenevyi Kamen gemstone deposit, Murun Complex, Eastern Siberia

Dokuchits

Jiang

Stepanov

et al. 2022

Ore Geology Reviews

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Crystal-Chemical Features of Rare and Complex Silicates from Charoite Rocks of the Malyy Murun Volcano-Plutonic Alkaline Complex

Cited by 3 publications

References 14 publications

Frankamenite: Relationship between the Crystal–Chemical and Vibrational Properties

Frankamenite: Relationship between the Crystal–Chemical and Vibrational Properties

High-temperature behaviour of fedorite, Na_2.5(Ca_4.5Na_2.5)[Si₁₆O₃₈]F₂⋅2.8H₂O, from the Murun Alkaline Complex, Russia

Geochemistry of Ca-(K)-(Na) silicates from charoitites in the Sirenevyi Kamen gemstone deposit, Murun Complex, Eastern Siberia

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Crystal-Chemical Features of Rare and Complex Silicates from Charoite Rocks of the Malyy Murun Volcano-Plutonic Alkaline Complex

Cited by 3 publications

References 14 publications

Frankamenite: Relationship between the Crystal–Chemical and Vibrational Properties

Frankamenite: Relationship between the Crystal–Chemical and Vibrational Properties

High-temperature behaviour of fedorite, Na2.5(Ca4.5Na2.5)[Si16O38]F2⋅2.8H2O, from the Murun Alkaline Complex, Russia

Geochemistry of Ca-(K)-(Na) silicates from charoitites in the Sirenevyi Kamen gemstone deposit, Murun Complex, Eastern Siberia

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High-temperature behaviour of fedorite, Na_2.5(Ca_4.5Na_2.5)[Si₁₆O₃₈]F₂⋅2.8H₂O, from the Murun Alkaline Complex, Russia