Sergey V Krivovichev

Saint Petersburg State University | SPBU · Department of Crystallography

Herein we report a crystal chemical and spectroscopic study of two anthropogenic ferrites: aciculite and srebrodolskite from the burnt dumps of the Chelyabinsk coal basin (South Urals, Russia).

The discovery of a large number of new U6+ minerals in recent years demonstrates the unique evolution of the natural material within the uranium deposits, but the processes of direct alteration of mineral species remain largely unexplored and not fully understood. In this paper we report on the investigation of the crystal chemical characteristics,...

The compound Na2CaPO4F has at least three polymorphic modifications: monoclinic α (also known as the natural mineral nacaphite), orthorhombic β and rhombohedral γ. All three polymorphs have antiperovskite-type structures belonging to either 2H (α and β) or 15R (γ) polytypes. The β-phase was synthesized using CaF2, NaF and Na3PO4 as initial reagents...

Through the combination of low-temperature hydrothermal synthesis and room-temperature evaporation, a synthetic phase similar in composition and crystal structure to the Earth’s most complex mineral, ewingite, was obtained. The crystal structures of both natural and synthetic compounds are based on supertetrahedral uranyl-carbonate nanoclusters tha...

Single crystals of Na2Cu⁺[Cu²⁺3O](AsO4 )2Cl (1) and Cu3[Cu3O]2(PO4)4Cl2 ( 2 ) were prepared by chemical vapor transport reactions. Both crystal structures are based upon the same [O2Cu6]⁸⁺ chains formed by corner-sharing (OCu4)⁶⁺ tetrahedra and interconnected by (TO4)³⁻ (T = P, As) tetrahedra into porous {[OCu3](TO4)2Cl}³⁻ frameworks. The channels...

The crystal structure of sergeysmirnovite, MgZn2(PO4)2·4H2O (orthorhombic, Pnma, a = 10.6286(4), b = 18.3700(6), c = 5.02060(15) Å, V = 980.26(6) Å3, Z = 4), a new member of the hopeite group of minerals, was determined and refined to R1 = 0.030 using crystals from the Këster mineral deposit in Sakha-Yakutia, Russia. Similar to other members of the...

Plagioclase is the major rock-forming mineral constituting the Earth’s crust, whereas anorthite (CaAl2Si2O8) is a common minerals in lunar highlands crust, meteorites, possibly in some comets and on Mercury. Besides anorthite, two high-temperature polymorphs of CaAl2Si2O8 are known: dmisteinbergite and svyatoslavite, which are found in burnt coal d...

How does one best subdivide nature into kinds? All classification systems require rules for lumping similar objects into the same category, while splitting differing objects into separate categories. Mineralogical classification systems are no exception. Our work in placing mineral species within their evolutionary contexts necessitates this lumpin...

Philipsburgite has been redefined as the ordered intermediate member of the goldhillite-philipsburgite-kipushite isomorphous series with the ideal formula Cu5Zn[(AsO4)(PO4)](OH)6·H2O. The new mineral goldhillite, ideally Cu5Zn(AsO4)2(OH)6·H2O [or Cu5Zn(AsO4)(AsO4)(OH)6·H2O], is the arsenate end-member of this series. Goldhillite occurs on fracture...

The complexities of chemical composition and crystal structure are fundamental characteristics of minerals that have high relevance to the understanding of their stability, occurrence and evolution. This review summarises recent developments in the field of mineral complexity and outlines possible directions for its future elaboration. The database...

Borophosphates of transition 3d metals are based on the mixed heteropolyhedral MTT- or MTTTr-type frameworks formed by MØ6 octahedra, two types of TØ tetrahedra (PO4 and BO4 tetrahedra), and, more rarely, TrO3 triangles (BO3 triangles). Family of compounds with the general formula A_{1-x}^+B_x^{2+}{M_x^{2+}M_{1-x}^{3+}[BP2O8(OH)]} (where A+ = K, Rb...

Zolotarevite (IMA2020-076), ideally Na 5 Zr[Si 6 O 15 (ОН) 3 ]⋅2–3H 2 O, is а new mineral of the lovozerite group. The mineral was found in a leucocratic nepheline syenite from Kedykverpakhk Mt., Lovozero alkaline massif, Kola Peninsula, Russia. It occurs as anhedral grains up to 1 mm across and is associated with microcline–perthite, nepheline, so...

The production of electrolytic nickel includes the stage of leaching of captured firing nickel matte dust. The solutions formed during this process contain considerable amounts of Pb, which is difficult to extraction due to its low concentration upon the high-salt background. The sorption of lead from model solutions with various compositions by sy...

For this study, the rare Cu-bearing silicate fumarolic assemblages from the Somma–Vesuvius volcano, Italy, characterised by the rare mineral litidionite, CuKNaSi 4 O 10 , were investigated. We report new data about Cu- and Ti-bearing phases found in these mineralisations, in which Ti-bearing litidionite occurs together with kamenevite, perovskite a...

The microporous titanosilicate sitinakite, KNa2Ti4(SiO4)2O5(OH)·4H2O, was first discovered in the Khibiny alkaline massif. This material is also known as IONSIV IE-911 and is considered as one of the most effective sorbents for Cs+ and Sr2+ from water solutions. We investigate a mechanism of cooperative crystal chemical adaptation caused by the inc...

Topological analysis of the heteropolyhedral MT framework (where M and T are octahedral and tetrahedral cations, respectively) in the eudialyte-type structure and its derivatives was performed based on a natural tiling analysis of the 3D cation. To analyze the migration paths of sodium cations in these structures, the Voronoi method was used. The p...

The crystal structure of Na2Mn3(SO4)4 compound (unit cell parameters a = 14.8307, b = 9.9107, c = 8.6845 Å, space group Cmc21) displays order-disorder (OD) character and can be described using the OD groupoid family, more precisely a family of OD structures built up by two kinds of non-polar layers, with layer symmetry P(m)c21 (L2n+1 type) and P(b)...

The high-pressure behavior of the borosilicate reedmergnerite NaBSi3O8 has been studied using in situ single-crystal X-ray diffraction and Raman spectroscopy up to 35 GPa. The crystal structure of NaBSi3O8 contracts...

Modularity is an important construction principle of many inorganic crystal structures that has been used for the analysis of structural relations, classification, structure description and structure prediction. The principle of maximal simplicity for modular inorganic crystal structures can be formulated as follows: in a modular series of inorgani...

In the experiments on volborthite in situ and ex situ heating, analogues of all known natural anhydrous copper vanadates have been obtained: ziesite, pseudolyonsite, mcbirneyite, fingerite, stoiberite and blossite, with the exception of borisenkoite, which requires the presence of As in the V site. The evolution of Cu-V minerals during in situ heat...

Anthropogenic rapidcreekite, Ca 2 (SO 4)(CO 3)·4H 2 O, from burnt dumps of coal mines in the Chelyabinsk coal basin, South Urals, Russia, previously described as 'korkinoite', has been studied by single-crystal X-ray diffraction, high-temperature powder X-ray diffraction, infrared (IR) and Raman spectroscopy. The mineral is orthorhombic, Pcnb, a =...

The crystal chemistry of high-pressure (HP) silicates has been reviewed with special emphasis on their structural topology and Si coordination. The HP silicates are subdivided into eleven major groups according to their chemical compositions: (i) SiO 2 polymorphs; (ii) feldspar polymorphs; (iii) pyroxene and amphibole high-pressure polymorphs; (iv)...

The mineralogy of carbonatites reflects both the diversity of the sources of their parent magmas and their unusual chemistry. Carbonatites contain diverse suites of both primary magmatic minerals and later hydrothermal products. We present a summary of the variety of minerals found in carbon-atites, and note the economic importance of some of them,...

The Lovozero peralkaline massif (Kola Peninsula, Russia) has several deposits of Zr, Nb, Ta and rare earth elements (REE) associated with eudialyte-group minerals (EGM). Eudialyte from the Alluaiv Mt. often forms zonal grains with central parts enriched in Zr (more than 3 apfu) and marginal zones enriched in REEs. The detailed study of the chemical...

Reddish-brown crystals of were prepared by chemical transport reactions. The crystal structure was solved using single-crystal diffraction data (a = 9.0472(5), b = 11.5591(4), c = 9.1786(5) Å, β = 118.692(7)°, V = 842.01(9) Å 3) and refined to R1 = 0.039 for 4369 independent observed reflections. The crystal structure consists of the anionic chains...

Structural complexity measures based on Shannon information entropy are widely used for inorganic crystal structures. However, the application of these parameters for molecular crystals requires essential modification, since atoms in inorganic compounds usually possess more degrees of freedom. In this work, a novel scheme for the calculation of com...

Single crystals of two novel shchurovskyite-related compounds, K2Cu[Cu3O]2(PO4)4 (1) and K2.35Cu0.825[Cu3O]2(PO4)4 (2), were synthesized by crystallization from gaseous phase and structurally characterized using single-crystal X-ray diffraction analysis. The crystal structures of both compounds are based upon similar Cu-based layers, formed by rods...

The crystal structures of compounds with the general formula Cs{[6]Al2[[4]TP6O20]} (where T = Al, B) display order-disorder (OD) character and can be described using the same OD groupoid family. Their structures built up by two kinds of non-polar layers, with the layer symmetries Pcn2 (L2n+1-type) and Pcam (L2n-type) (category IV). All ordered poly...

The crystal structure of nikmelnikovite, Ca 12 Fe ²⁺ Fe ³⁺ 3 Al 3 (SiO 4 ) 6 (OH) 20 , a new member of the garnet supergroup from Kovdor massif, Kola Peninsula, Russia ( R $\bar{3}$ , a = 17.2072(6), c = 10.5689(4) Å, V = 2710.1(2) Å ³ and Z = 3) has been refined to R 1 = 0.046 on the basis of 1184 unique observed reflections. Nikmelnikovite is the...

Microporous slicates with the pharmacosiderite structure and the general formula A 3– x H 1+ x [Ti 4 O 4 (SiO 4 ) 3 ](H 2 O) n ( A = Na, K, Cu), ( n = 6–9, x = 0–2) are outstanding in their ion-exchange properties. The ivanyukite mineral group consists of three species, one of which has two polymorphs. The minerals forming a progressive series: iva...

Nine different samples of fluorellestadite from Chelyabinsk, Kizel and Kuznetsk coal basins were studied by single-crystal X-ray diffraction analysis, thermal X-ray diffraction (25–800 °C), Infrared (IR) and Raman spectroscopy. Fluorellestadite is hexagonal, space group P63/m, the unit-cell parameters for the nine samples studied vary within rather...

Averievite-type compounds with the general formula (MX)[Cu5O2(TO4)], whereM= alkali metal, X = halogen and T = P, V, have been synthesized by crystallization from gases and structurally characterized for six different compositions: 1 (M = Cs; X = Cl; T = P), 2 (M = Cs; X = Cl; T = V), 3 (M= Rb; X = Cl; T = P), 4 (M= K; X = Br; T = P), 5 (M= K; X =...

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...

A new sodium manganese-nickel phosphate of alluaudite supergroup with the general formula NaMnNi2(H2/3PO4)3 was synthesized by a hydrothermal method. The synthesis was carried out in the temperature range from 540 to 660 K and at the general pressure of 80 atm from the oxides mixture in the molar ratio MnCl2: 2NiCl2: 2Na3PO4: H3BO3: 10H2O. The crys...

The crystal structures of natural (Mt. Koashva, Khibiny alkaline massif, Kola Peninsula, Russian Arctic) and synthetic (obtained from an aqueous solution of sodium phosphate and sodium fluoride (1:1) by evaporation at room temperature (RT)) natrophosphate, Na7(PO4)2F·19H2O, have been investigated using single-crystal X-ray diffraction analysis. Nat...

Dobrovolskyite, Na 4 Ca(SO 4 ) 3 , is a new sulfate mineral from the Great Tolbachik fissure eruption, Kamchatka peninsula, Russia. It occurs as aggregates of tabular crystals up to 1–2 mm in maximum dimension, with abundant gas inclusions. The empirical formula calculated on the basis of O = 12 is (Na 3.90 K 0.10 ) Σ4 (Ca 0.45 Mg 0.16 Cu 0.12 Na 0...

A new mineral, dioskouriite, CaCu4Cl6(OH)4∙4H2O, represented by two polytypes, monoclinic (2M) and orthorhombic (2O), which occur together, was found in moderately hot zones of two active fumaroles, Glavnaya Tenoritovaya and Arsenatnaya, at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcan...

Crystallization of the M²⁺[(UO2)(T⁶⁺O4)2(H2O)](H2O)4 (M²⁺ = Ni, Mg, Zn, Co, Fe and Mn; T⁶⁺ = S, Se) compounds is characterized by the presence of three different structure types, which are built by the similar uranyl-based sulfate/selenate chains linked into pseudolayers through H-bonding networks, but the stacking sequences are different and can b...

Compounds with the fresnoite structure type possess remarkable chemical diversity and a range of unique physical properties, including nonlinear optical (NLO) activity. K2Sb(P2O7)F, which was reported recently, belongs to this group and its structure is not novel in terms of either the topology or local coordination geometry around the Sb³⁺ cations...

Compounds with the fresnoite structure type possess remarkable chemical diversity and a range of unique physical properties, including nonlinear optical (NLO) activity. K2Sb(P2O7)F, which was reported recently, belongs to this group and its structure is not novel in terms of either the topology or local coordination geometry around the Sb³⁺ cations...

Layered microporous titanosilicate AM-4 (Aveiro-Manchester-4) is a synthetic analog of microporous lintisite-type minerals. We applied the hydrothermal method to synthesize AM-4 compound from different titanium sources, i.e. titanium (III) chloride solution, titanyl-sulfate (titanite ore treatment product) and sodium metasilicate by stepwise coolin...

Technogenic steklite, KAl(SO4)2, and unnamed mineral phase (K,Na)3Na3(Fe,Al)2(SO4)6 from burnt dumps of the Chelyabinsk Coal Basin have been investigated by single-crystal X-ray diffraction and electron microprobe analysis. Steklite is trigonal, space group P3¯, a = 4.7277(3), c = 7.9871(5) Å, V = 154.60(2) Å3. The crystal structure was refined to...

Minerals contain important clues to understanding the complex geologic history of Earth and other planetary bodies. Therefore, geologists have been collecting mineral samples and compiling data about these samples for centuries. These data have been used to better understand the movement of continental plates, the oxidation of Earth's atmosphere an...

The Na 2−n H n [Zr(Si 2 O 7)]·mH 2 O family of minerals and related compounds (n = 0-0.5; m = 0.1) consist of keldyshite, Na 3 H[Zr 2 (Si 2 O 7) 2 ], and parakeldyshite, Na 2 [Zr(Si 2 O 7)], and synthetic Na 2 [Zr(Si 2 O 7)]·H 2 O. The crystal structures of these materials are based upon microporous heteropolyhedral frameworks formed by linkage of...

The main goal of the paper is to contribute to the agenda of developing an algorithmic model for crystallization and measuring the complexity of crystals by constructing embeddings of 3D parallelohedra into a primitive cubic network (pcu net). It is proved that any parallelohedron P as well as tiling by P, except the rhombic dodecahedron, can be em...

The various aspects of polymorphism in the feldspar family of minerals are considered with special emphasis upon their structural diversity and complexity. The feldspar family is defined as consisting of valid minerals and unnamed or conditionally named mineral phases with the general formula M n+ [ ] , w h e r e n is the average charge of the M n+...

Large and growing data resources on the spatial and temporal diversity and distribution of the more than 400 carbon-bearing mineral species reveal patterns of mineral evolution and ecology. Recent advances in analytical and visualization techniques leverage these data and are propelling mineralogy from a largely descriptive field into one of predic...

Most research on polyoxometalates (POMs) has been devoted to synthetic compounds. However, recent mineralogical discoveries of POMs in mineral structures demonstrate their importance in geochemical systems. In total, 15 different types of POM nanoscale-size clusters in minerals are described herein, which occur in 42 different mineral species. The...

Through the years, mineralogical studies have produced a tremendous amount of data on the atomic arrangement and mineral properties. Quite often, structural analysis has led to elucidate the role played by minor components, giving interesting insights into the physico-chemical conditions of minerals and allowing the description of unpredictable str...

The chemical diversity and complexity of tellurium minerals were analyzed using the concept of mineral systems and Shannon informational entropy. The study employed data for 176 Te mineral species known today. Tellurium minerals belong to six mineral systems in the range of one-to-six species-defining elements. For 176 tellurium minerals, only 36 c...

Crystal chemistry of the variscite and metavariscite groups: Crystal structures of synthetic CrAsO4⋅2H2O, TlPO4⋅2H2O, MnSeO4⋅2H2O, CdSeO4⋅2H2O and natural bonacinaite, ScAsO4⋅2H2O - Uwe Kolitsch, Matthias Weil, Vadim Kovrugin, Sergey V. Krivovichev