Dr J. Wittemannstrasse 5

Niedernhausen, Germany

Dr J. Wittemannstrasse 5

Niedernhausen, Germany

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Chukanov N.V.,RAS Institute of Problems of Chemical Physics | Aksenov S.M.,RAS Nesmeyanov Institute of Organoelement Compounds | Rastsvetaeva R.K.,Russian Academy of Sciences | Mohn G.,Dr J. Wittemannstrasse 5 | And 6 more authors.
European Journal of Mineralogy | Year: 2016

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, magnesiocopiapite, and jarosite. Magnesiovoltaite forms yellow, brownish-yellow or pale yellowish-greenish isometric crystals up to 2 mm across. The main crystal forms are {111} and {100}; the subordinate forms are {110} and {211}. The new mineral is brittle, with subconchoidal fracture; cleavage is not observed. Mohs' hardness is 21/2. Dmeas = 2.51(2) g/cm3, Dcalc = 2.506 g/cm3. Magnesiovoltaite is optically anomalously anisotropic, uniaxial with e = 1.584(2) and γ = 1.588(2), or biaxial (-) with a = 1.584(2), Β = 1.587(2), and γ = 1.588 (2). Possible causes of the optical anomalies are discussed. The infrared spectrum is given. The chemical composition is (EDS-mode electron microprobe, all iron is considered as Fe3+ in accordance with Mössbauer data, H2O by gas chromatography of ignition products, wt. %): Na2O 0.13, K2O4.64, MgO 9.13, MnO1.73, ZnO0.84, Al2O3 2.47, Fe2O3 13.36, SO3 50.83, H2O 17.6, total 100.73. The empirical formula based on 66 O atoms per formula unit (apfu) is (K1.85Na0.08)(Mg4.25Mn0.46Zn0.14)Fe3+3.14Al0.91(SO4) 11.91(H2O)18.325O0.035. The simplified formula is K2Mg5Fe3+3Al(SO4)12•18H2O. The crystal structure has been refined to R = 3.2% using 1147 unique reflections with I > 2s(I). Magnesiovoltaite is cubic, Fd-3c, a = 27.161(1) Å, V = 20038(2) Å3, and Z = 16. Magnesiovoltaite is isostructural with other cubic voltaite-group minerals. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 9.56 (29) (022), 6.77 (37) (004), 5.53 (61) (224), 3.532 (68) (137), 3.392 (100) (008), 3.034 (45) (048), 2.845 (30) (139). The type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia. © 2016 E. Schweizerbart'sche Verlagsbuchhandlung.


Chukanov N.V.,RAS Institute of Problems of Chemical Physics | Krivovichev S.V.,Saint Petersburg State University | Chernyatieva A.P.,Saint Petersburg State University | Mohn G.,Dr J. Wittemannstrasse 5 | And 4 more authors.
Canadian Mineralogist | Year: 2013

The new mineral vendidaite was discovered in the abandoned La Vendida mine, near Sierra Gorda, Antofagasta Region, Atacama desert, Chile. Associated minerals are aubertite, magnesioaubertite, belloite, eriochalcite, alunite, kaolinite, and halloysite. Vendidaite forms colorless platy crystals up to 0.01 × 0.3 × 0.3 mm in size; these occur in clusters up to 0.5 mm across. Vendidaite is brittle, with estimated Mohs' hardness of 2-2 1/2 and perfect cleavage on (010). Dmeas = 1.97(1) g/cm3, Dcalc = 1.974 g/cm3. The new mineral is optically biaxial (+), α = 1.522(2), β = 1.524(2), γ = 1.527(2), 2V (meas.) = 75(15)°, 2V (calc.) = 79°. Infra-red spectrum is given. The chemical composition (electron microprobe, H2O by gas chromatography) is (in wt.%): Al2O3 28.51, Fe2O3 1.39, SO3 22.38, Cl 9.87, H2O 38.8, O = Cl -2.23, total 98.72. The empirical formula is: Al1.96Fe3+ 0.06(SO4)0.98 Cl0.98(OH)3.12·5.98H2O. The crystal structure was solved using single-crystal X-ray diffraction data (R1 = 0.044). Vendidaite is monoclinic, space group C2/c, a 11.9246(16), b 16.134(2), c 7.4573(9) Å, β 125.815(2)°, V 1163.4(3) Å3, and Z = 4. The structure is based upon [Al2(OH)3(H2O)6]3+ chains of edge- and corner-sharing [Al(OH,H2O)] octahedra running parallel to the a axis. The chains are linked by hydrogen bonds to (SO4) tetrahedra and Cl- anions to form pseudolayers parallel to the (010) plane. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 6.78 (59) (111¯), 4.849 (94) (021), 4.366 (80) (131¯), 4.030 (75) (040, 111), 3.855 (100) (311¯), 3.285 (59) (131), 2.435 (52) (261¯). Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4335/1.


Chukanov N.V.,RAS Institute of Problems of Chemical Physics | Aksenov S.M.,Saint Petersburg State University | Rastsvetaeva R.K.,Russian Academy of Sciences | Lyssenko K.A.,Russian Academy of Sciences | And 4 more authors.
Mineralogical Magazine | Year: 2015

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 clusters and random aggregates. The mineral is brittle. Mohs hardness is 2; Dmeas = 2.53(3), Dcalc = 2.549 g cm-3. The infrared spectrum shows the presence of oxalate anions and the absence of absorptions associated with H2O molecules, C-H bonds, CO32-,NO-3-and OH- ions. Antipinite is optically biaxial (+), α = 1.432(3), β = 1.530(1), γ = 1.698(5), 2Vmeas = 75(10)°, 2Vcalc = 82°. The chemical composition (electron-microprobe data, C measured by gas chromatography of products of ignition at 1200°C, wt.%) is Na2O 15.95, K2O 5.65, CuO 27.34, C2O3 48.64, total 99.58. The empirical formula is K0.96Na2O4Cu2.03(C2.00O4)4 and the idealized formula is KNa3Cu2(C2O4)4. The crystal structure was solved and refined to R = 0.033 based upon 4085 unique reflections with I > 2σ(I ). Antipinite is triclinic, space group P1, a = 7.1574(5), b = 10.7099(8), c = 11.1320(8) Å, α = 113.093(1), β = 101.294(1), γ = 90.335 (1)°, V = 766.51(3) Å3, Z = 2. The strongest reflections of the powder X-ray diffraction pattern [d, Å (I,%) (hkl)] are 5.22 (40) (111), 3.47 (100) (03 2), 3.39 (80) (210), 3.01 (30) (033, 220), 2.543 (40) (122, 03 4, 104), 2.481 (30) (213), 2.315 (30) (14 3, 3 10), 1.629 (30) (14 6, 4 14 , 243, 160). © 2015 by Walter de Gruyter Berlin/Boston.


Chukanov N.V.,RAS Institute of Problems of Chemical Physics | Zubkova N.V.,Moscow State University | Mohn G.,Dr. J. Wittemannstrasse 5 | Pekov I.V.,Moscow State University | And 2 more authors.
Geology of Ore Deposits | Year: 2015

A new mineral, chanabayaite, has been discovered at a guano deposit located at Mt. Pabellón de Pica near the village of Chanabaya, Iquique Province, Tarapacá region, Chile. It is associated with salammoniac, halite, joanneumite, nitratine and earlier chalcopyrite. Chanabayaite occurs as blue translucent imperfect prismatic crystals, up to 0.05 × 0.1 × 0.5 mm in size, and their radial aggregates. Chanabayaite is brittle, with a Mohs’ hardness of 2. The cleavage is perfect on (001) and imperfect on (100) and (010). Dmeas = 1.48(2) g/cm3, Dcalc = 1.464 g/cm3. The mineral is optically biaxial (–), α = 1.561(2), β = 1.615(3), γ = 1.620(2), 2Vmeas = 25(10)°, 2Vcalc = 33°. Pleochroism is strong, Z ≈ Y (deep blue) ≫ X (pale blue with gray tint). IR spectrum is given. The chemical composition (electron microprobe data for Cu, Fe and Cl; gas chromatography data for H, N, C and O) is as follows (wt %): 32.23 Cu, 1.14 Fe, 16.13 Cl, 3.1 H, 29.9 N, 12.2 C, 3.4 O, total is 98.1. The empirical formula is (Z = 4): Cu1.92Fe0.08Cl1.72N8.09C3.85H11.66O0.81. The structural model was based on the single-crystal X-ray diffraction data (R = 0.1627). Chanabayaite is orthorhombic, space group Imma, a = 19.484(3), b = 7.2136(10), c = 11.999(4) Å, V = 1686.5(7) Å3, Z = 2. In chanabayaite, chains of the corner-sharing Cu(l)-centered octahedra and single Cu(2)-centered octahedra are linked via 1,2,4-triazolate anions C2N3H2 -. NH3 and Cl– are additional ligands coordinating Cu2+. Chanabayaite is a transformational mineral species formed by leaching of Na and one third of Cl and partial dehydration of the protophase Na2Cu2Cl3(N3C2H2)2(NH3)2 • 4H2O. The strongest reflections in the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are detected: 10.19 (100) (101), 6.189 (40) (011), 5.729 (23) (301), 5.216 (75) (211, 202), 4.964 (20) (400), 2.830 (20) (602, 413, 503), 2.611 (24) (123, 422, 404). © 2015, Pleiades Publishing, Ltd.


Chukanov N.V.,RAS Institute of Problems of Chemical Physics | Mohn G.,Dr J. Wittemannstrasse 5 | Pekov I.V.,Moscow State University | Belakovskiy D.I.,Russian Academy of Sciences | And 3 more authors.
European Journal of Mineralogy | Year: 2014

The new mineral okruschite (IMA No. 2013-097), the arsenate analogue of roscherite, was discovered in a hydrothermal vein cross-cutting rhyolite exposed in the Fuchs quarry, near Sailauf, Spessart Mountains, Bavaria, Germany. Associated minerals are braunite, Mn-bearing calcite and arseniosiderite. Okruschite forms tabular aggregates up to 0.15 x 0.3 x 0.3 mm in size of curved and somewhat misaligned laths. It is white, semitransparent; lustre is vitreous. Dmeas = 3.33(2), Dcalc = 3.340 g/cm3. Okruschite is optically biaxial (-), α = 1.671(3), β = 1.682(2), γ = 1.687(3), 2Vmeas = 65(5)°. The infrared spectrum is given. The chemical composition is (electron microprobe, B and Li by ICP MS, H2O by gas chromatography of ignition products, wt. %): Li2O 0.04, BeO 7.70, MgO 1.68, CaO 8.28, MnO 16.27, FeO 4.89, Al2O30.22, As2O551.11, H2O 11.0, total 101.19. The empirical formula based on 34 O atoms is: Ca1.99(Mn3.09Fe0.92Mg0.56Al0.06Li0.04)Σ4.67Be4.15(AsO4)5.99(OH)3.64·6.40H2O. The simplified formula is Ca2Mn2+ 5Be4(AsO4)6(OH)4·6H2O. Okruschite is monoclinic, C2/c, a = 16.33(4), b = 12.03(3), c = 6.93(1) A˚, β, b = 94.84(5)°, V = 1357(4) A˚3, Z = 2. The strongest lines of the powder X-ray diffraction pattern [d, A˚ (I, %) (hkl)] are: 9.68 (39) (110), 4.95 (34) (310), 4.17 (34) (-311), 3.25 (100) (-202, 330), 3.11 (32) (-421), 2.841 (27) (240), 2.711 (26) (600), 1.726 (26) (461, -552, 004). Okruschite is named after Professor Martin Okrusch, from Germany. Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow. © 2014 E. Schweizerbart'sche Verlagsbuchhandlung.


Zubkova N.V.,Moscow State University | Chukanov N.V.,RAS Institute of Problems of Chemical Physics | Pekov I.V.,Moscow State University | Mohn G.,Dr. J. Wittemannstrasse 5 | And 4 more authors.
Zeitschrift fur Kristallographie - Crystalline Materials | Year: 2016

The crystal structure of a new natural compound NaCu2Cl3[N3C2H2]2[NH3]2·4H2O, (further denoted I in the text) from a guano deposit located on the Pabellón de Pica Mountain, Iquique Province, Tarapacá Region, Chile, was studied by single-crystal low-temperature (200 K) XRD, R=2.42%. The compound I is orthorhombic, space group P212121; a=19.484(3), b=7.2136(10), c=11.999(4) Å, V=1686.5(7) Å3, Z=4. The crystal structure of I contains zig-zag chains of the corner-sharing Cu(1)-centered octahedra running along the a axis and isolated Cu(2)-centered octahedra connected with the chains via 1,2,4-triazolate anions. This structural fragment is close to that found in the mineral chanabayaite, Cu2(N3C2H2)2Cl(NH3, Cl, H2O, □)4. In contrast to Na-free chanabayaite, in the structure of I Na cations occupy Na(H2O)6 octahedra connected via common edges to form chains parallel to the chains of Cu(1)-centered octahedra. I is the second natural compound, after chanabayaite, with 1,2,4-triazolate anions N3C2H2 - and is assumed to be a protophase of chanabayaite; the latter was presumably formed as a result of Na and Cl leaching and dehydration of I. © 2016 by De Gruyter.

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