Nadezhda ShchipalkinaLomonosov Moscow State University | MSU · Department of Mineralogy
Nadezhda Shchipalkina
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Publications (16)
Single crystals of “malakhovite” (an anthropogenic silico-oxide from burnt dumps of the Chelyabinsk coal basin; sp. gr. P , a = 10.555(4) Å, b = 10.928(3) Å, c = 9.059(3) Å, α = 106.338(12)°, β =95.87(7)°, γ = 124.40(2)°, V = 781.0(5) Å 3, Z = 1, R1 = 0.0378 have been investigated by electronprobe micro analysis, Raman spectroscopy, and X-ray diffr...
—We overview recent data on the mineralogy of oxidizing-type fumaroles of the Tolbachik Volcano (Kamchatka, Russia), with the main focus on the chemical specifics of the minerals. The active fumarole fields of Tolbachik are the most prominent mineral-forming exhalative system of this type in the world. About 350 mineral species, including 123 miner...
This second of two companion articles devoted to silicate
mineralization in fumaroles of the Tolbachik volcano (Kamchatka, Russia)
reports data on chemistry, crystal chemistry and occurrence of
tectosilicates: sanidine, anorthoclase, ferrisanidine, albite, anorthite,
barium feldspar, leucite, nepheline, kalsilite, sodalite and hauyne.
Chemical and...
The influence of pentavalent arsenic and phosphorus on crystal chemical features of the feldspar framework was studied on the minerals belonging to the sanidine–filatovite solid-solution series from fumarolic exhalations of the Tolbachik volcano (Kamchatka, Russia). The reported feldspars demonstrate the first example of natural continuous solid so...
Dalnegorskite, a new pyroxenoid with the crystal chemical formula Ca2Ca2MnCa(Si3O9)2 and simplified formula Ca5Mn(Si3O9)2, is a rock-forming mineral in the B-bearing calcic skarns in the Dalnegorsk borosilicate deposit (Dalnegorsk, Primorsky Krai, Russia). It belongs to the bustamite structural type and forms a continuous solid-solution series with...
A new mineral, metathénardite, ideally Na2SO4, the high-temperature hexagonal dimorph of thénardite, a natural analogue of the synthetic phase Na2SO4(I), was found in the sublimates of active fumaroles at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure eruption, Tolbachik volcano, Kamchatka, Russia. The holotype o...
This paper presents the nomenclature of the rhodonite group accepted by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA). An overview of the previous studies of triclinic (space group P $\bar{1}$ ) pyroxenoids belonging to the rhodonite structure type, with a focus on their crystal...
Unusual variety of forsterite strongly enriched by pentavalent constituents, phosphorus and arsenic (up to 12.9 wt% P2O5 and up to 16.0 wt% As2O5) was found in sublimates of the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia, in association with As- and P-depleted forsterite, anhydrite, diopside, hematite, spinel, haüyne, fluorapatite,...
Dorrite, khesinite and rhönite from metamorphosed calcic xenoliths of the Bellerberg paleovolcano (Eifel, Germany) were studied, including first determination of the crystal structure of natural dorrite (R = 0.0636). Dorrite is triclinic, P-1, unit-cell parameters are: a = 10.4316(7), b = 10.8236(9), c = 8.9488(7) Å, α = 105.972(6), β = 96.003(9),...
The crystal chemical role of iron in Fe-rich pyroxenoids with bustamite-type structure was studied on five samples containing from 6.0 to 10.3 wt% FeO using electron microprobe, XRD crystal structure refinement and Mössbauer spectroscopy. The crystal chemical formulae are (Z = 1): M1(Mn0.85Fe²⁺0.15)2M2(Ca0.8Mn0.2)2M3(Fe2 +0.5Mn0.4(Mg,Al,Zn)0.1)M4Ca...
This paper is a review devoted to a special type of arsenic mineralization related to volcanic fumaroles of the oxidizing type. Fifty-four hydrogen-free arsenates (40 valid species and 14 insufficiently characterized phases) with Cu2+, Mg, Al, Fe3+, Ti4+, Zn, Ca, Na, and K are identified here and 46 of them are endemics of fumarolic formation. Fift...
The new mineral ferrorhodonite, a Mn²⁺–Fe²⁺ ordered analogue of rhodonite with the idealized formula CaMn3Fe[Si5O15], was found in the manganese-rich metamorphic rocks of the Broken Hill Pb–Zn–Ag deposit, Yancowinna Co., New South Wales, Australia. Ferrorhodonite occurs as brownish red coarsely crystalline aggregates in association with galena, cha...
The pyroxferroite and pyroxmangite from xenoliths of aluminous gneisses in the alkaline basalts of Bellerberg paleovulcano (Eifel, Germany) have been studied by electron-probe and X-ray diffraction methods and IR spectroscopy. The parameters of the triclinic unit cells are found to be a = 6.662(1) Å, b = 7.525(1) Å, c = 15.895(2) Å, α = 91.548(3)°,...
The crystal structure of dorrite, a member of the rhönite group, from the burnt dump of a coal mine No. 45 in Kopeisk (South Urals, Russia) was solved by direct methods based on single-crystal X-ray diffraction data and refined to R = 0.0373 % [3937 reflections with I > 2σ (I)]. Dorrite is triclinic, space group P 1, V = 747.83(10) Å 3 . The empiri...