Ramiza K. RastsvetaevaRussian Academy of Sciences | RAS · Institute of Crystallography
Ramiza K. Rastsvetaeva
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Publications (314)
The crystal structure of the recently discovered eudialyte group mineral, amabellite-(Ce) Na15[(Ce1.5Na1.5)Mn3]Mn2Zr3£Si[Si24O69(OH)3](OH)2 · H2O, found in the hyperagpaitic pegmatite of the Saint-Amable massif (Canada), has been solved by X-ray structural analysis within the space group R3. Amabellite-(Ce) is a member of the eudialyte group with t...
Research subject . The crystal structure of christofschäferite-(Ce) was previously refined in terms of the P 2 1 / m low-symmetrical space group, which allowed the local features of cationic arrangements to be determined. In this work, we set out to refine the crystal structure of christofschäferite-(Ce) in terms of the P 2 1 / a high-symmetrical sp...
The modular approach is a powerful tool in current inorganic crystal chemistry. It enables not only a more detailed analysis of the known structures and the determination of structural relationships between them, but also the prediction of potentially novel structures that can be applied in modern materials science. A large number of examples of co...
A variety of the mineral nezilovite, containing antimony and an elevated amount of titanium, has been studied using microprobe and X-ray diffraction analysis. The diffraction experiment was performed on a crystal presenting an aggregate of nezilovite and högbomite with close unit-cell parameters. The parameters of the hexagonal cell of the nezilovi...
A variety of the mineral nezilovite, containing antimony and an elevated amount of titanium, has been studied using microprobe and X-ray diffraction analysis. The diffraction experiment was performed on a crystal presenting an aggregate of nezilovite and högbomite with close unit-cell parameters. The parameters of the hexagonal cell of the nezilovi...
A hydrated eudialyte-group mineral from the Inagli alkaline massif (Kola Peninsula) has been investigated by electron-probe and X-ray diffraction analyses. The parameters of the trigonal unit cell are as follows: a = 14.1558(3) Å, c = 30.998(1) Å, V = 5378.6(3) Å3, sp. gr. R3; the calculated density is 2.661 g/cm3. The crystal structure is refined...
Hydronium (oxonium) cation H3O+ plays an important role in mineralogy and mineral structures. However, it is rather difficult to detect it using conventional methods of crystal structure analysis. In particular, hydronium-bearing eudialyte-group minerals (EGMs) are well known. In this paper, we provide data on a low-temperature X-ray structure anal...
This paper is an overview of available data on crystal structures, crystal chemical features, physical and chemical properties, and genesis of multilayer microporous compounds related to cancrinite and sodalite (CRCs). These compounds meet the criteria for considering them as zeolite-type materials and molecular sieves. Ten types of the CRCs’ frame...
A potentially new mineral, M2Na-dominant analogue of eudialyte from the Khibiny alkaline massif, was investigated using the methods of electron probe microanalysis, X-ray diffraction, and IR spectroscopy. The crystal structure was refined to R = 5.7% in the anisotropic approximation of atomic displacements using 2577 independent reflections with F...
Odikhinchaite, a Sr-Mn-Nb-CO3-dominant eudialyte-group mineral from the Khibiny alkaline complex has been investigated using the methods of electron probe microanalysis, X-ray diffraction, infrared and Mössbauer spectroscopy. The crystal structure was refined to R = 3.4 % in the anisotropic approximation of atomic displacements using 3815 independe...
A new niobium-rich lomonosovite variety with a high degree of ordering of Ti and Nb atoms has been investigated by X-ray diffraction analysis and electron probe microanalysis. Its simplified formula is Na 10 Ti 2 (Nb,Fe,Ti) 2 (Si 2 O 7) 2 (PO 4) 2 O 4. The triclinic unit-cell parameters are a = 5.411(1) Å, b = 7.108(1) Å, c = 14.477(2) Å, α = 99.78...
Minerals of the eudialyte group from ultra-agpaitic associations are often characterized by high contents (up to the dominance) of sodium at the M2 site, which is populated with iron in eudialyte. The features of blocky isomorphism with the replacement of IVFe2+ by IVNa and VNa at the M2 micro-region are discussed. Using the methods of electron pro...
The Mössbauer, infrared and Raman spectra of iron-rich oxyphlogopite from a new locality, the Bartoy occurrence, Transbaikalia, Russia were obtained and its crystal structure was solved. The mineral is characterized by the absence of OH groups and an ordered distribution of Fe2+ and Fe3+ between sites having octahedral coordination. Unlike oxyphlog...
Unusual agpaitic syenites containing up to 25 vol. % lamprophyllite-group minerals (lamprophyllite, fluorlamprophyllite, barytolamprophyllite, and the new mineral species fluorbarytolamprophyllite, IMA 2016-089) have been discovered in the Niva intrusion and Mokhnatye Roga alkaline dyke belonging to the Kola Alkaline Province, northwestern Russia....
A new modular eudialyte-group mineral—titanosilicate—from the Lovozero massif has been investigated using X-ray diffraction. The trigonal-cell parameters are found to be a = 14.069(4) Å, c = 60.63(1) Å, and V = 10393(1) Å3; sp. gr. R m. The crystal structure is refined to final reliability factor R = 5.6% in the anisotropic approximation of atomic...
Single crystals of compounds based on novel microporous heteropolyhedral frameworks containing Ce and Er were synthesized hydrothermally and their structures were determined. The triclinic unit cell parameters of K7[Ce3(Si12O32)]⋅2H2O and K7[Er3(Si12O32)]⋅2H2O, respectively, are as follows: a = 6.9833(2), 6.8334(3) Å, b = 11.4171(3), 11.4474(3) Å,...
The crystal structure of a new modular eudialyte-group mineral from the Khibiny massif—potassium-rich analog of labyrinthite—has been investigated using X-ray diffraction. The trigonal-cell parameters are found to be a = 14.2167(6) Å, c = 60.798(3) Å, and V = 10641.8(1) ų; sp. gr. R\(\bar {3}\)m. The crystal structure is refined to the final relia...
The crystal structure of manganonaujakasite was studied by single crystal X-ray analysis and infrared spectroscopy using a holotype sample with the empirical chemical formula (Na5.96Ca0.01) (Mn0.53Fe0.49)Al3.95Si8.03O26.00. The monoclinic unit cell parameters are: a = 15.029(1) Å b = 7.999(1) Å c = 10.467(1) Å β = 113.551(1)°; V = 1153.47(15) ų, s...
The new eudialyte-group mineral siudaite, ideally Na8(Mn2+2Na)Ca6Fe3+3Zr3NbSi25O74(OH)2Cl·5H2O, was discovered in a peralkaline pegmatite situated at the Eveslogchorr Mt., Khibiny alkaline massif, Kola Peninsula, Russia. The associated minerals are aegirine, albite, microcline, nepheline, astrophyllite, and loparite-(Ce). Siudaite forms yellow to b...
The crystal structure of aqualite from the Khibiny massif, a high-oxonium eudialyte-group mineral, has been refined by X-ray diffraction analysis using a set of low-temperature (110 K) experimental data. The trigonal-cell parameters are found to be a = 14.1435(4) Å, c = 31.410(1) Å, V = 5441.4(4) ų, sp. gr. R3m. The structure is refined to the fin...
An abnormally titanium-rich mineral of the eudialyte group was studied by IR spectroscopy and X-ray diffraction. The trigonal unit cell parameters are a = 14.165(1) Å, c = 30.600(5) Å, V = 5317.23(4) ų, sp. gr. R3m. The crystal structure was refined to R = 0.034 with anisotropic displacement parameters using 2530 reflections with F > 3σ(F). The id...
An eudialyte group mineral, found in pegmatites of the Odikhincha massif (the northern part of the Siberian platform), has been investigated using X-ray diffraction, IR spectroscopy, and Raman spectroscopy. The mineral is characterized by a high strontium content and a low chlorine content. It has a trigonal unit cell with the following parameters:...
Mn ²⁺ -bearing eleonorite from the Hagendorf South pegmatite situated south of Waidhaus, Upper Palatinate, Bavaria, Germany was study based on single crystal X-ray analysis, Mn and Fe K -edge XANES spectroscopy, as well as IR spectroscopy. According to spectroscopic data, all Mn is bivalent, and all Fe is trivalent. The empirical formula of the min...
Labuntsovite-Fe, an Fe-dominant member of the labuntsovite subgroup, was first discovered in the Khibiny alkaline massif on Mt Kukisvumchorr [Khomyakov et al. (2001). Zap. Vseross. Mineral. Oba,130, 36–45]. However, no data are published about the crystal structure of this mineral. Labuntsovite-Fe from a peralkaline pegmatite located on Mt Nyorkpak...
Agardite-(Ce) from Clara Mine, Schwarzwald, Germany, has been investigated by means of electron microprobe analysis, single-crystal X-ray analysis, XANES spectroscopy and IR spectroscopy. Hexagonal unit-cell parameters are: a = 13.598(6), c = 5.954(3) Å; V = 953.5(2) ų; space group P63/m. The structure has been solved and refined to final R1 = 3.8...
A new eudialyte-group mineral, ilyukhinite, ideally (H 3 O,Na) 14 Ca 6 Mn 2 Zr 3 Si 26 O 72 (OH) 2 · 3H 2 O, has been found in peralkaline pegmatite at Mt. Kukisvumchorr, Khibiny alkaline pluton, Kola Peninsula, Russia. It occurs as brownish orange, with vitreous luster anhedral grains up to 1 mm across in hydrothermally altered peralkaline rock, i...
The new mineral roymillerite Pb24Mg9(Si9AlO28)(SiO4)(BO3)(CO3)10(OH)14O4, related to britvinite and molybdophyllite, was discovered in a Pb-rich assemblage from the Kombat Mine, Grootfontein district, Otjozondjupa region, Namibia, which includes also jacobsite, cerussite, hausmannite, sahlinite, rhodochrosite, barite, grootfonteinite, Mn–Fe oxides,...
A hydroxyl-dominant analogue of gadolinite-(Y) (OH-Gad) has been discovered in the Heftetjern granitic pegmatite, southern Norway, in association with late-stage rare-earth-element containing minerals. The empirical formula, based on ten O atoms per formula unit, is (Y1.285Ca0.55Ce0.07La0.04Nd0.01)Σ1.955(Fe²⁺0.57□0.43)Be2.02Si1.995O8.48(OH)1.52. Th...
The crystal structure of a representative of eudialyte group, which was found by A.P. Khomyakov at the Rasvumchorr mountain of the Khibiny alkaline massif (Kola Peninsula), has been studied by X-ray diffraction. The trigonal unit-cell parameters are found to be a = 14.2328(5) Å, c = 60.217(2) Å, V = 10564.08(3) Å3, sp. gr. R3m. The structure has be...
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 Sr-rich eudialyte group mineral from pegmatites of Odichinche massif on the North of Siberian platform was studied using single crystal X-ray diffraction data. The trigonal unit-cell parameters are: a = 14.2700(6), c = 30.057(1) Å; V = 5300.6(1) Å3; space group R3m. The structure is refined to R = 0.047 in atomic displacements’ anisotropic appr...
Eleonorite, ideally Fe6³⁺(PO4)4O(OH)4· 6H2O, the analogue of beraunite Fe²⁺Fe³⁺5 (PO4)4(OH)5· 6H2O with Fe²⁺ completely substituted by Fe³⁺, has been approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification as a mineral species (IMA 2015-003). The mineral was first described on material fro...
The crystal structure of ilyukhinite, a new mineral of the eudialyte group, is studied by X-ray dif-fraction. The mineral found in pegmatite bodies of the Kukisvumchorr Mountain (Khibiny alkaline complex) is characterized by low sodium content, high degree of hydration, and predominance of manganese over iron. The trigonal cell has the following pa...
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)°,...
Vesuvianite containing 5.85 wt% TiO2 from an Alpine-cleft-type assemblage outcropped near Alchuri, Shigar Valley, Northern Areas, has been investigated by means of electron microprobe analyses, gas-chromatographic analysis of H2O, X-ray powder diffraction, single-crystal X-ray structure refinement, ²⁷Al NMR, ⁵⁷Fe Mössbauer spectroscopy, IR spectros...
The structure of the sodium-rich representative of the eudialyte group found by A.P. Khomyakov at the Lovozero massif (Kola Peninsula) is studied by X-ray diffraction. The trigonal cell parameters are: а = 14.2032(1) and с = 60.612(1) Å, V = 10589.13 Å 3 , space group R3m. The structure is refined to the final R = 5.0% in the anisotropic approximat...
A sample of magnesio-ferri-hornblendite, a potential new mineral of the amphibole supergroup, was studied by X-ray diffraction and IR spectroscopy. The crystal chemical formula is (Z = 2): A K (C a 1.92 Na 0.08) C [ M(1) (Mg 1.78 Fe) M(2) (Mg 1.62 Fe Al 0.12) M(3) (Mg 0.64 Fe Mn 0.04)] [ T (Si 7.44 Al 0.56)O 22 ] W (OH) 2. The monoclinic unit cell...
The new mineral riotintoite was discovered in the abandoned La Vendida mine, near Sierra Gorda, Antofagasta Region, Atacama desert, Chile. Associated minerals are vendidaite, eriochalcite, Mg-rich aubertite, magnesioaubertite, belloite, alunite, kaolinite, and halloysite. Riotintoite forms colorless platy crystals up to 0.1 × 0.4 × 0.4 mm in size a...
A sample of holotypic calcium catapleiite from the Burpala alkaline massif (Northern Baikal, Russia) is studied by single crystal X-ray analysis at 120 K and IR spectroscopy. The empirical formula of calcium catapleiite is Ca0.97Na0.02Zr1.01Si3O9 • 2H2O (Z = 4). The X-ray diffraction study confirms the orthorhombic unit cell with the following para...
The crystal structures of the lamprophyllite-related minerals are based upon HOH modules consisting of a central octahedral O sheet sandwiched between two heteropolyhedral H sheets. The general crystal-chemical formula for these minerals can be written as [10–11] A 2 [[6] M 1[6] M 22[6]2 M 3 X 2] [[5] L 2(Si2O7)2O2], where the contents of the O and...
Magnesiovoltaite, a new voltaite-group mineral, was discovered in the Alcaparrosa mine, Cerro Alcaparrosa, El Loa province, Antofagasta region, Chile, in two associations, one of which includes coquimbite, tamarugite, alum-(Na), rhomboclase, yavapaiite, voltaite and opal, and the other one is botryogen, opal, tamarugite, alum-(K), pickeringite, mag...
A new mineral ilyukhinite, ideally (H 3 O,Na) 14 Ca 6 Mn 2 Zr 3 Si 26 O 72 (OH) 2 $3H 2 O, has been found in a peralkaline pegmatite at the Mount Kukisvumchorr, Khibiny alkaline massif, Kola Peninsula, Russia. It occurs as brownish-orange, with vitreous luster, anhedral grains up to 1 mm across in a hydrot-hermally altered peralkaline rock, in asso...
A new mineral, mendigite (IMA no. 2014-007), isostructural with bustamite, has been found in the In den Dellen pumice quarry near Mendig, Laacher Lake area, Eifel Mountains, Rhineland-Palatinate (Rheinland-Pfalz), Germany. Associated minerals are sanidine, nosean, rhodonite, tephroite, magnetite, and a pyrochlore-group mineral. Mendigite occurs as...
The variations in the chemical composition of lamprophyllite-group minerals from a peralkaline dyke of the Mokhnatye Roga area (Kandalaksha region, Kola Peninsula), which are crystallized during the entire period of dyke formation and form several generations, have been investigated. The early generations differ in a steadily high fluorine content,...
The crystal structure of the hydrated analog of the mineral rastsvetaevite (tentatively called “hydrorastsvetaevite”), which was found by A.P. Khomyakov in ultraagpaitic pegmatites at the Rasvumchorr Mountain of the Khibiny alkaline massif (Kola Peninsula), has been determined by single crystal X-ray diffraction. The trigonal unit-cell parameters a...
The new oxalate mineral antipinite is found in a guano deposit located on the Pabellón de Pica Mountain, Iquique Province, Tarapacá Region, Chile. Associated minerals are halite, salammoniac, chanabayaite, joanneumite and clays. Antipinite occurs as blue, imperfect, short prismatic crystals up to 0.1 mm × 0.1 mm × 0.15 mm in size, as well as their...
The new mineral calcinaksite, ideally KNaCa(Si4O10) · H2O, the first hydrous and Ca-dominant member of the litidionite group, is found in a xenolith of metamorphosed carbonate-rich rock from the southern lava flow of the Bellerberg volcano, Eastern Eifel region, Rheinland-Pfalz, Germany. It is associated with wollastonite, gehlenite, brownmillerite...
The new mineral möhnite, ideally (NH4)K2Na(SO4)2, the ammonium analogue of aphthitalite, is found in a guano deposit on the Pabellón de Pica mountain, near Chanabaya, Iquique Province, Tarapacá Region, Chile. It is associated with salammoniac, halite, joanneumite, natroxalate, nitratine, chanabayaite, and a clay mineral. Möhnite occurs as random ag...
Abstract—The structure of ferro-pedrizite—a new lithium mineral of the amphibole supergroup—has been
studied by single-crystal X-ray diffraction. Fe2+ ions dominate over Mg in the chemical composition of this
mineral. The parameters of the monoclinic unit cell are a = 9.3716(4) Å, b = 17.649(1) Å, c = 5.2800(6) Å,
and β = 102.22(1)°. The experiment...
A new mineral rossovskyite named after L.N. Rossovsky was discovered in granite pegmatites of the Bulgut occurrence, Altai Mts., Western Mongolia. Associated minerals are microcline, muscovite, quartz, albite, garnet of the almandine–spessartine series, beryl, apatite, triplite, zircon, pyrite, yttrobetafite-(Y) and schorl. Rossovskyite forms flatt...
Ferro-pedrizite, a new amphibole-supergroup mineral was discovered in the Sutlug pegmatite occurrence situated in the Targi River Basin, Tyva Republic, Eastern Sibera, Russia. The associated minerals are quartz, albite, microcline, spodumene, cassiterite, beryl, columbite-(Mn), fergusonite-β-(Y), fluorapatite, schorl, trilithionite and fluorite. Fe...
A specimen of iron-rich bustamite from the Broken Hill deposit (Australia) has been studied by single-crystal X-ray diffraction and by Mössbauer and IR spectroscopy. The triclinic unit-cell parameters are as follows: a = 7.1301(4) Å, b = 7.6940(3) Å, c = 7.7345(4) Å, α = 79.352(4)°, β = 62.951(6)°, γ = 76.149(3)°, V = 365.49(3) Å 3 , sp. gr. P. The...
Almeidaite (IMA 2013-020), ideally Pb(Mn, Y)Zn2(Ti,Fe3+)18O36(O, OH)2, from Novo Horizonte, Bahia, Brazil, occurs in association with quartz, rutile, anatase, hematite, kaolinite, muscovite, xenotime-(Y) and bastnaesite-(La). Almeidaite
forms isolated, black, opaque, sub-metallic, platy crystals flattened on [0001], measuring up to 30 mm 6 30 mm 6...
A new mineral, mendigite (IMA no. 2014�007), isostructural with bustamite, has been found in
the In den Dellen pumice quarry near Mendig, Laacher Lake area, Eifel Mountains, Rhineland�Palatinate
(Rheinland�Pfalz), Germany. Associated minerals are sanidine, nosean, rhodonite, tephroite, magnetite,
and a pyrochlore�group mineral. Mendigite occurs as...
A single�crystal sample of iron�rich schüllerite found at the Kahlenberg quarry in the
Eifel paleovolcanic field (Germany) was studied by X�ray diffraction. The triclinic unit�cell param�
eters are as follows: a = 5.4061(1) Å, b = 7.0416(6) Å, c = 10.2077(7) Å, α = 99.86(1)°, β =
97.8(1)°, and γ = 89.98(1)°. The structure was solved by direct metho...
Calcinaksite, KNa[Ca(H2O)][Si4Ol0], a new natural member of the litidionite group, was found in a calcic xenolith from alkaline basalt of the Bellerberg volcano, Eastern Eifel region, Rhineland–Palatinate, Germany. The crystal structure has been studied based on single-crystal X-ray diffraction data. Triclinic unit-cell parameters are: a = 7.021 (2...
The crystal structure of eudialyte of hydrothermal genesis from Sushina Hill, India, where it was
found associated with potassium feldspathoid, albite, aegirine, and nepheline, has been solved by X�ray dif�
fraction analysis. One specific feature of the chemical composition of this mineral is a low content of CaO
(7–8.5 wt %) and an elevated mangan...
The crichtonite group combines minerals with the general formula XII A VI B IV T 2 VI C 18 O 38 , where A = Ba, Ti 4+ , Fe 3+ , Cr, Nb, V 5+ , Mn 3+ , or Al (the Roman numerals indicate the coorr dination numbers) and comprises 13 approved mineral species and an inadequately studied mineral with high uranium content, which crystallize in the rhombo...