Rusinovite, Ca10 (Si2 O7)3 Cl2: a new skarn mineral from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia

Galuskin, Evgeny V.; Galuskina, Irina O.; Lazić, Biljana; Armbruster, Thomas; Zadov, Aleksandr E.; Krzykawski, Tomasz; Banasik, Kamila; Газеев, В.М.; Pertsev, N. N.

doi:10.1127/0935-1221/2011/0023-2160

Cited by 23 publications

(21 citation statements)

References 12 publications

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“…Nowadays the phases from that mine are considered as anthropogenic, despite the fact that eight phases from the same locality have previously been accepted as mineral species: bazhenovite [1], godovikovite [2], dmisteinbergite [3], svyatoslavite [4], rorisite [5], efremovite [6], srebrodolskite [7] and fluorellestadite [8]. It is worthy to note that many phases first described from the burned dumps of the Chelyabinsk coal basin by Chesnokov and co-authors [9] were later found in natural environments (e.g., novograblenovite [10], pyracmonite [11], kumtyubeite [12], harmunite [13], ghiaraite [14], steklite [15], khesinite [16], rusinovite [17], etc. ).…”

Section: Introductionmentioning

confidence: 99%

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

et al. 2019

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The technogenic mineral phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the burned dumps of the Chelyabinsk coal basin have been investigated by single-crystal X-ray diffraction, scanning electron microscopy and high-temperature powder X-ray diffraction. The NH4MgCl3·6H2O phase is monoclinic, space group C2/c, unit cell parameters a = 9.3091(9), b = 9.5353(7), c = 13.2941(12) Å, β = 90.089(8)° and V = 1180.05(18) Å3. The crystal structure of NH4MgCl3·6H2O was refined to R1 = 0.078 (wR2 = 0.185) on the basis of 1678 unique reflections. The (NH4)2Fe3+Cl5·H2O phase is orthorhombic, space group Pnma, unit cell parameters a = 13.725(2), b = 9.9365(16), c = 7.0370(11) Å and V = 959.7(3) Å3. The crystal structure of (NH4)2Fe3+Cl5·H2O was refined to R1 = 0.023 (wR2 = 0.066) on the basis of 2256 unique reflections. NH4MgCl3·6H2O is stable up to 90 °C and then transforms to the less hydrated phase isotypic to β-Rb(MnCl3)(H2O)2 (i.e., NH4MgCl3·2H2O), the latter phase being stable up to 150 °C. (NH4)2Fe3+Cl5·H2O is stable up to 120 °C and then transforms to an X-ray amorphous phase. Hydrogen bonds provide an important linkage between the main structural units and play the key role in determining structural stability and physical properties of the studied phases. The mineral phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O are isostructural with natural minerals novograblenovite and kremersite, respectively.

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Section: Introductionmentioning

confidence: 99%

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

et al. 2019

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“…Rusinovite, Ca 10 (Si 2 O 7 ) 3 Cl 2 , was found in 2011 in an altered carbonate-silicate xenolith from the Upper Chegem Caldera located in Kabardino-Balkaria, Northern Caucasus, Russia. These rocks are formed at high-temperature and low-pressure conditions ( [1][2][3]. Besides their natural occurrence, rusinovite-type synthetic phases were also described from anthropogenic formations.…”

Section: Introductionmentioning

confidence: 99%

“…Both rusinovite and the synthetic analogue are reported as strongly elongated grains, which form needle-like single crystals or spherulites composed of fibrous aggregates [1,6]. The structure of the synthetic phase was primarily reported as order-disorder (OD) structure with an orthorhombic unit cell [6], but later its structure was redefined as monoclinic [4].…”

Section: Introductionmentioning

confidence: 99%

“…The structure of the synthetic phase was primarily reported as order-disorder (OD) structure with an orthorhombic unit cell [6], but later its structure was redefined as monoclinic [4]. Galuskin et al [1] have described the structure of rusinovite as columns of disordered "face-sharing" disilicate units extending parallel to a. At a local level, only each second Si 2 O 7 unit (along a) can be occupied in the structure.…”

Section: Introductionmentioning

confidence: 99%

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New Occurrence of Rusinovite, Ca10(Si2O7)3Cl2: Composition, Structure and Raman Data of Rusinovite from Shadil-Khokh Volcano, South Ossetia and Bellerberg Volcano, Germany

et al. 2018

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Rusinovite, Ca10(Si2O7)3Cl2, was found at two new localities, including Shadil-Khokh volcano, South Ossetia and Bellerberg volcano, Caspar quarry, Germany. At both of these localities, rusinovite occurs in altered carbonate-silicate xenoliths embedded in volcanic rocks. The occurrence of this mineral is connected to specific zones of the xenolith characterized by a defined Ca:Si < 2 ratio. Chemical compositions, as well as the Raman spectra of the investigated rusinovite samples, correspond to the data from the locality of rusinovite holotype—Upper Chegem Caldera, Northern Caucasus, Russia. The most intense bands of the Raman spectra are related to vibrations of (Si2O7) groups. Unit cell parameters of rusinovite from South Ossetia are: a = 3.76330(4) Å, b = 16.9423(3) Å, c = 17.3325(2) Å, V = 1105.10(4) Å3, Z = 2. The performed synchrotron radiation diffraction experiments did not confirm a doubling of c as reported for the synthetic phase, Ca10(Si2O7)3Cl2. However, one-dimensional diffuse scattering parallel to b* has been observed. This can be interpreted with an ordered arrangement of Si2O7 groups creating layers with a doubled a parameter. Consequently, the two different displacements of neighbouring layers allow random stacking faults to occur.

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“…New data on the composition and structure of rusinovite Ca 10 (Si 2 O 7 ) 3 Cl 2 , found in altered xenoliths of Eifel and Southern Ossetia, are presented byŚrodek et al [7]. Until now rusinovite was known only from xenoliths within ignimbrites of the Upper Chegem Caldera at Northern Caucasus, Russia [8].…”

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Editorial for Special Issue “New Mineral Species and Their Crystal Structures”

Galuskina

Pekov

2019

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Rusinovite, Ca10 (Si2 O7)3 Cl2: a new skarn mineral from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia

Cited by 23 publications

References 12 publications

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

Crystal Chemistry and High-Temperature Behaviour of Ammonium Phases NH4MgCl3·6H2O and (NH4)2Fe3+Cl5·H2O from the Burned Dumps of the Chelyabinsk Coal Basin

New Occurrence of Rusinovite, Ca10(Si2O7)3Cl2: Composition, Structure and Raman Data of Rusinovite from Shadil-Khokh Volcano, South Ossetia and Bellerberg Volcano, Germany

Editorial for Special Issue “New Mineral Species and Their Crystal Structures”

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