A5048182180- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystal Structures and Properties
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Radioactive element chemistry and processing
- Mineralogy and Gemology Studies
- Chemical Synthesis and Characterization
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Nuclear materials and radiation effects
- Geochemistry and Elemental Analysis
- Solid-state spectroscopy and crystallography
- Glass properties and applications
- Astro and Planetary Science
- Inorganic Fluorides and Related Compounds
- Inorganic Chemistry and Materials
- Layered Double Hydroxides Synthesis and Applications
- Metal Extraction and Bioleaching
- Clay minerals and soil interactions
- Crystallography and molecular interactions
- Pigment Synthesis and Properties
- Recycling and utilization of industrial and municipal waste in materials production
- Methane Hydrates and Related Phenomena
- Coal and Coke Industries Research
St Petersburg University
2017-2025
Abstract Mariakrite is a new mineral in the hydrotalcite supergroup, and member of novel family layered double hydroxides, or LDH. It first reported LDH with dithioferrate, [Fe3+S2]− role an interlayer anion, cementitious Ca-aluminate (AFm phase) intercalated sulfide, sulfide-intercalated completely solved crystal structure. was discovered late hydrothermal assemblages confined to pyrometamorphic lithologies Hatrurim Formation, Negev Desert on Israeli side Dead Sea. The forms saber-like...
Abstract Germanium is a classic trace element that rarely forms its own minerals but plays significant role in geochemical and cosmochemical classification schemes. The behavior of this very contrasting, depending on the redox environment sulfur activity geosystems. Siderophile germanium, form native germanides, has been reported several terrestrial meteoritic occurrences, majority these phases have poorly characterized. In study, we report discovery Ni3Ge, new germanide mineral, named...
Abstract This paper is a first detailed report of natural hexagonal solid solutions along the join Fe2P–Ni2P. Transjordanite, Ni2P, Ni-dominant counterpart barringerite (a low-pressure polymorph Fe2P), new mineral. It was discovered in pyrometamorphic phosphide assemblages Hatrurim Formation (the Dead Sea area, Southern Levant) and named for occurrence on Transjordan Plateau, West Jordan. Later on, mineral confirmed Cambria meteorite (iron ungrouped, fine octahedrite), it likely occurs CM2...
Abstract Cyclophosphates are a class of energy-rich compounds whose hydrolytic decomposition (ring opening) liberates energy that is sufficient for initiation biomimetic phosphorylation reactions. Because that, cyclophosphates might be considered as likely source reactive prebiotic phosphorus on early Earth. A major obstacle toward adoption this hypothesis have so far not been encountered in nature. We herein report the discovery these minerals terrestrial environment, at Dead Sea basin...
Phosphorus is one of the key elements, which determined emergence primordial life on our planet. The source prebiotic phosphorus was most likely to be easily soluble compounds containing in negative form oxidation (e.g., phosphides). present paper first thorough investigation phosphide-bearing mineral assemblages confined telluric (terrestrial) native iron from volcanic rocks Disko Island, Greenland. speciation given varies solid solution (up 0.3 wt% P), different phosphides – schreibersite...
Abstract Allabogdanite, (Fe,Ni) 2 P, is the only known natural high-pressure phase reported in Fe–Ni–P system. The mineral, which was previously described from a single meteorite, Onello iron, now discovered Santa Catharina and Barbianello nickel-rich ataxites. occurrence of allabogdanite Catharina, one largest well-studied meteorites, suggests that this mineral more common than believed. formation allabogdanite-bearing phosphide assemblages given meteorite provides evidence it experienced...
Abstract Schreibersite, (Fe,Ni)3P, the most abundant cosmic phosphide, is a principal carrier of phosphorus in natural Fe-Ni-P system and likely precursor for prebiotic organophosphorus compounds at early stages Earth’s evolution. The crystal structure mineral contains three metal sites allowing unrestricted substitution Fe Ni. distribution these elements across could serve as tracer crystallization conditions schreibersite its parent celestial bodies. However, discrimination between (Z =...
Abstract Keplerite is a new mineral, the Ca-dominant counterpart of most abundant meteoritic phosphate, which merrillite. The isomorphous series merrillite-keplerite, Ca9NaMg(PO4)7-Ca9(Ca0.5☐0.5) Mg(PO4)7, represents main reservoir phosphate phosphorus in solar system. Both minerals are related by heterovalent substitution at B-site crystal structure: 2Na+ (merrillite) → Ca2+ + ☐ (keplerite). near-end-member keplerite origin occurs main-group pallasites and angrites. detailed description...
Abstract Minerals formed at high pressures are sensitive indicators of extreme pressure-temperature conditions that occur in nature. The discovery the high-pressure polymorph (Fe,Ni)2P, allabogdanite surficial pyrometamorphic rocks Hatrurim Formation (the Mottled Zone) surrounding Dead Sea basin Israel is first terrestrial occurrence a mineral previously only found iron meteorites. Stepwise annealing experiments demonstrate metastable ambient pressure and it irreversibly transforms into its...
Active volcanic fumaroles are one of the most spectacular natural objects in terms mineral diversity. The Great Tolbachik Fissure Eruption (GTFE) (Kamchatka) renowned for its exceptional number species. total species that have been reliably identified from this particular locality exceeds 600, which is approximately 10 % all known minerals to date. In study, we employ a comprehensive approach (bulk chemistry, microprobe analysis, powder X-ray diffraction, HR computed tomography, and 34S,...
Pb-dominant tourmaline was synthesized at 700 °C and 200 MPa in two hydrothermal experiments the system MgO-Al2O3-B2O3-SiO2-PbO-H2O (run OV-4-2) MgO-Al2O3-B2O3-SiO2-PbO-CaO-Na2O-H2O OV-5-3), respectively. Run OV-4-2 forms needle-like (lengths up to 7 μm), lead-rich (up 13.3 wt% PbO) crystals that are chemically homogeneous. OV-5-3 columnar 400 μm) zoned (Pb-rich cores, 14.7 PbO, Pb-poor rims, ~2 PbO). Additional phases form trace amounts Pb-feldspar, quartz, diaspore (in talc, mullite,...
Abstract Exhalative mineral assemblages from fumaroles of Tolbachik volcano are very rich in anhydrous sulfate minerals alkali and transition metals. Koryakite, ideally NaKMg 2 Al (SO 4 ) 6 , was found the Yadovitaya fumarole Second scoria cone North Breach Great Fissure Eruption (1975–1976), volcano, Kamchatka Peninsula, Russia. Koryakite occurs as a product fumarolic activity closely associates with euchlorine langbeinite. is trigonal, R $\bar{3}$ = 8.1124(11), c 22.704(7) Å V 1294.0(5) 3...
The mineral-like anthropogenic phase Zn(NH3)2Cl2, with ammine (NH30) complexes from the burned dumps of Chelyabinsk coal basin (South Urals, Russia), has been investigated using single-crystal and high-temperature powder X-ray diffraction, Raman infrared (IR) spectroscopy. Zn(NH3)2Cl2 is orthorhombic, Imma, a = 7.7399(6), b 8.0551(5), c 8.4767(8) Å, V 528.49(7) Å3, R1 0.0388 at −73 °C. Its crystal structure based upon isolated ZnN2Cl2 tetrahedra connected by hydrogen bonds (between NH3...