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4. Nikmelnikovite, Ca12Fe2+Fe\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$_{3}^{{3 + }}$$\end{document}Al3(SiO4)6(OH)20: A New Mineral from the Kovdor Massif (Kola Peninsula, Russia)

Author

Krivovichev, S. V., Yakovenchuk, V. N., Panikorovskii, T. L., Savchenko, E. E., Pakhomovsky, Ya. A., Mikhailova, Yu. A., Selivanova, E. A., Kadyrova, G. I., and Ivanyuk, G. Yu.

Published
2019
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13. Sergeysmirnovite, MgZn2(PO4)2 · 4H2O, a New Mineral from the Kester Deposit (Sakha-Yakutia, Russia).

Author

Yakovenchuk, V. N., Pakhomovsky, Y. A., Konopleva, N. G., Panikorovskii, T. L., Bazai, A. V., Mikhailova, J. A., Bocharov, V. N., and Krivovichev, S. V.

Subjects
*X-ray powder diffraction, *MINERALS, *ORE deposits, *QUARTZ, *UNIT cell, *FLUORAPATITE, *GOLD ores
Abstract

Sergeysmirnovite, MgZn2(PO4)2 · 4H2O, is a new mineral from the oxidation zone of the Kester mineral deposit, Sakha-Yakutia, Russia. This mineral forms tabular colorless crystals growing on quartz and fluorapatite aggregates in association with pseudomalachite, libethenite, native copper, a Na-analogue of batagayite, arsenolite, tobermorite, epifanovite, and batagayite. The mineral is orthorhombic, with the space group Pnma. The unit cell parameters refined from powder X-ray diffraction data are the following: a = 10.5957(6) Å, b = 18.365(1) Å, c = 5.0320(4) Å, V = 979.16 (8) Å3. The eight most intense powder X-ray diffraction lines are the following (I-d[Å]-hkl): 100-5.28-200; 33-4.576-040; 24-3.999-230; 24-3.877-031; 22-3.387-221; 44-3.015-250; 57-2.854-311; 34-2.647-400. Sergeysmirnovite belongs to the hopeite group and is dimorphous with reaphookhillite. The mineral is named in honor of famous Soviet geologist, Academician Sergei Sergeevich Smirnov (1895–1947), a renowned specialist in the mineralogy of ore deposits. [ABSTRACT FROM AUTHOR]

Published
2022
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30. Epifanovite, NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O: a New Mineral from the Kester Deposit, Sakha (Yakutia) Republic, Russia.

Author

Yakovenchuk, V. N., Pakhomovsky, Ya. A., Konoplyova, N. G., Panikorovskii, T. L., Mikhailova, Yu. A., Bocharov, V. N., Krivovichev, S. V., and Ivanyuk, G. Yu.

Abstract

Epifanovite, NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O, a new natural copper, sodium and calcium arsenate-phosphate, has been found in a quartz-phosphate pocket within greisenized cassiterite-bearing granodiorite of the Kester tin deposit, Sakha (Yakutia) Republic, Russia. The mineral occurs as crusts of tabular pseudotetragonal crystals up to 50 μm across and 10 μm thick. Associated minerals are fluorapatite, pseudomalachite, malachite, a Na-analogue of batagayite, tobermorite, libethenite, arsenolite, native copper and unknown Mg-Zn phosphate. Epifanovite is turquoise-blue with pale blue streak, vitreous luster (dull in crusts), and a Mohs hardness of 3. The mineral is brittle. Cleavage is perfect on (001) and good on (100) and (010). Density measured in the Clerici solution is 3.65(3) g/cm3; the calculated density is 3.73 g/cm3. Epifanovite is optically biaxial (-), α = 1.708(5), β = 1.730(5), γ = 1.735(5). 2Vobs = 40°-45°, 2Vcalc = 50°. Optical orientation: X = a, Y = b. The empirical formula calculated on the basis of P + As = 5 is (Na0.94K0.06)Σ1.00(Ca0.82Na0.08)Σ0.90(Cu5.04Zn0.06)Σ5.10(PO4)4[(As0.81P0.19)Σ1.00(O1.92OH2.06Cl0.02)Σ4.00] · 7.37H2O. The idealized formula is NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O. The Raman spectrum contains the following bands, cm-1: 293, 359 (ν1-2, CuO5); 455, 556, 594, 640, 921, 962, 1002, 1086, 1153 (ν1-4, PO4), 77, 121, 161, 183, 730, 828, 858 (ν1-3, AsO4), 2900, 3200, 3410 (ν1, OH). The mineral is monoclinic, P21/m, a = 9.6912(9), b = 9.7440(9), c = 9.9561(9) Å, β = 102.23 (1)°, V = 918.7(1) Å3, Z = 2. The strongest reflections in the powder X-ray diffraction pattern are, I-dÅ-hkl: 100-9.73-001, 35-6.79-110, 12-4.355-021, 43-3.072-130, 24-3.061-221, 24-3.003-2¯22, 11-2.698-023, 10-1.6775-504. The mineral was named in honor of the Russian geologist Porphyry Prokop'evich Epifanov, who discovered the Ege-Khaya and Kester tin deposits. Epifanovite is structurally close to the lavendulan-group minerals and related species: andyrobertsite, calcioandyrobertsite, mahnertite and richelsdorfite. [ABSTRACT FROM AUTHOR]

Published
2018
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33. Nikmelnikovite, Ca12Fe2+FeAl3(SiO4)6(OH)20: A New Mineral from the Kovdor Massif (Kola Peninsula, Russia).

Author

Krivovichev, S. V., Yakovenchuk, V. N., Panikorovskii, T. L., Savchenko, E. E., Pakhomovsky, Ya. A., Mikhailova, Yu. A., Selivanova, E. A., Kadyrova, G. I., and Ivanyuk, G. Yu.

Subjects
*MINERALS, *PENINSULAS, *MINING engineering, *GARNET, *COLLEGE teachers
Abstract

Nikmelnikovite, Ca12Fe2+Fe Al3(SiO4)6(OH)20, a new mineral from the Kovdor massif (Kola Peninsula, Russia), is described. It is the first trigonal representative of the garnet supergroup. The mineral is named in honor of Academician Nikolai Nikolaevich Melnikov (1938–2018), an outstanding Soviet and Russia mining engineer, long-time (1981–2015) director of the Mining Institute of the Kola Science Center, Russian Academy of Sciences. [ABSTRACT FROM AUTHOR]

Published
2019
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36. Kihlmanite-(Ce), Ce2TiO2[SiO4](HCO3)2(H2O), a new rare-earth mineral from the pegmatites of the Khibiny alkaline massif, Kola Peninsula, Russia

Author

Yakovenchuk, V. N., primary, Krivovichev, S.V., additional, Ivanyuk, G. Y., additional, Pakhomovsky, Ya. A., additional, Selivanova, E.A., additional, Zhitova, E. A., additional, Kalashnikova, G. O., additional, Zolotarev, A. A., additional, Mikhailova, J. A., additional, and Kadyrova, G. I., additional

Published
2014
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