Journal/NDM45 2010 eng

New Data on Minerals, vol.45, 2010

New data on Minerals. Volume 45. 2010. 168 pages, 99 images, drawings, schemes.
Editor: Prof. Margarita I. Novgorodova.
Publication of the Institution of Russian Academy of Sciences, Fersman Mineralogical Museum RAS.

Содержание

1 Summary
2 Editorial Board
3 Publishing group
4 Сontent

Summary

This volume contains papers on the newly discovered mineral species – aleksandrovite, the Sn-analogue of baratovite, and åskagenite-(Nd), a new mineral of epidote supergroup. Discoveries of the rare minerals – irarsite (from ores of the Shanuch deposit in Kamchatka), orickite, jaipurite, westerveldite, edgarite, tungstenite and other chalcogenides (from the Khibiny massif in Kola peninsula) are described. New data on accessory minerals from the Semeninskaya pit in the Aduy pegmatite field in the Ural Mts., on arsenosulvanite and other sulphides from the Lebedinoe deposit in the Aldan Mts., on the composition and features of native gold from an ore occurrence in South-Eastern Kamchatka, are given. Zoned crystals of monazite(Ce) from granite pegmatites of the Ilmeny Mts. are studied, including radiology dating. Problems of mineralogy and geochemistry of tetravalent uranium, uranium ores and sulfide-oxide associations in modern submarine pyrites, are covered.
In the chapter “Mineral museums and collections” there is a paper on the exhibition in the Fersman Mineralogical Museum RAS dedicated to the 125th anniversary of Alexander N. Labuntsov – the discoverer of apatite deposits in the Khibiny Mts.
The next chapter – “Personalities” – for the first time brings forward letters found in the RAS archives from Alexander N. Labuntsov to academician Vladimir I. Vernadsky. The “Mineralogical notes” chapter includes description of rare intergrowth twins of magnetite from the Kurzhunkul deposit, Kazakhstan, and discussion of previous mistakes in the calculation of the chemical composition of some minerals.
The “Discussions” is represented by the paper on the problems of the definition of a valid mineral species and metastable mineralization.
The journal is of interest to mineralogists, geochemists, geologists and also researchers of Natural History museums, collectors and amateurs.

Editorial Board

Editor in Chief Margarita I. Novgorodova, Doctor in Science, Professor
Executive Editor Elena A. Borisova, Ph.D.
Eugeny I. Semenov, Doctor in Science,
Svetlana N. Nenasheva, Ph.D.,
Elena N. Matvienko, Ph.D.,
Marianna B. Chistyakova, Ph.D.,
Mikhail E. Generalov, Ph.D.

Publishing group

Photo Michael B. Leybov
Leader of Publishing group Michael B. Leybov
Managing Editor Ludmila A. Cheshko
Art Director Nikolay O. Parlashkevich
Editor Andrey L. Cheshko
Design and Layout Ivan A. Glazov
Translators Maria S. Alferova, Il'ya A. Anisimov, Ivan A. Baksheev, Mark Fed’kun, Valerii V. Gerasimovskii, Mikhail Povarennykh
Editors (English Style) Patricia Gray, Frank C. Hawthorne, Peter Modreski

Authorized for printing by Institution of Russian Academy of Sciences, Fersman Mineralogical Museum RAS
Text, photo, drawings and schemes, Institution of Russian Academy of Sciences,
Fersman Mineralogical Museum RAS, 2010
Design BRITAN Ltd, 2010
Published by Institution of Russian Academy of Sciences, BRITAN Ltd Fersman Mineralogical Museum RAS Box 71 Moscow Bld. 18/2 Leninskii Prospekt Moscow 119071 Russia Phone/fax +7 (495) 629-48-12 Phone +7 (495) 952-00-67; fax +7 (495) 952-48-50 email: minbooks@online.ru
email: mineral@fmm.ru www.minbook.com
www.fmm.ru
Circulation 300 copies
Printed in Russia

Сontent

New Minerals and Their Varieties, New Finds of Rare Minerals, Mineral Paragenesis

Pautov L.А., Agakhanov А.А., Karpenko V.Y., Gafurov F.G. Aleksandrovite, KLi₃Ca₇Sn₂[Si₆O₁₈]₂F₂ – a new tin mineral, p. 5 - 16

Aleksandrovite, KLi3Ca7Sn2[Si6O18]2F2 is a new mineral, the tin analogue of baratovite. It was discovered in a moraine boulder of microcline-calcite rock, along with quartz, albite, aegirine-hedenbergite pyroxene, in the Darai-Pioz glacier (Tajikistan). The mineral association is represented by baratovite, fluorite, miserite, Sn-bearing titanite, bazirite, pabstite, Sn-bearing sogdianite, sugilite, turkestanite, fluorapatite (apatite(CaF)). The new mineral occurs in two types: a) minute (up to 50–70 μm) lamellar grains with no zoning visible under BSE, and b) crystals (up to 0.8 mm) and aggregates of zoned and sectorial grains with separate zones of aleksandrovite, and baratovite or katayamalite. The mineral is colourless, transparent, with vitreous lustre and pearl lustre on cleaved surface. Streak colour is white. Cleavage is perfect along (001). Density (measured) = 3.05(2) g/cm³, density (calculated) = 3.07(2) g/cm³. Microhardness is 300 kg/mm². Mohs hardness is 4–4.5. It fluoresces light-blue under short wave UV (254 nm). The mineral is biaxial, optically negative: n_p = 1.629(2), n_m = 1.635(4), n_g = 1.638(2) (589 nm); 2V (calculated) = –70.3°. Dispersion is strong, r > v. Elongation is positive, angle of extinction varies from 0° to 22°. Aleksandrovite is monoclinic, C2/c, a = 17.01(2), b = 9.751(6), c = 21.00(2) Å, b = 112.45(8)° , V = 3219(7) Å3 , Z = 4. The strongest X-Ray lines are as follows: (d in Å (I) (hkl)): 4.86(21)(31–1); 3.712(33)(312); 3.234(100)(006); 3.206(34)(223); 3.039(28)(025); 2.894(42)(314); 2.425(42)(008); 1.950(25)(426). Chemical analysis (EMPA, an average out of 17 analyses; Li₂O – ICP OES, H₂O – calculated; wt.%): SiO₂ – 48.01, Al₂O₃ – 0.07, TiO₂ – 2.86, SnO₂ – 12.84, ZrO₂ – 1.27, Nb₂O₅ – 0.11, Fe₂O₃ – 0.27, Ce₂O₃ – 0.04, MgO – 0.05, CaO – 25.52, SrO – 0.39, Na₂O – 0.20, K₂O – 2.91, Li₂O – 3.01, F – 1.71, H₂O – 0.39, (-O=F₂) = 0.72, total 99.12. Empiric formula of aleksandrovite - (K_0.93Na_0.10)_1.03Li_3.02(Ca_6.82Sr_0.06Mn_0.04Mg_0.02)_6.94(Sn_1.28Ti_0.54 Zr_0.15Fe_0.05Nb_0.01)_2.03(Si_11.98Al_0.02)₁₂O_36.00[F_1.35(OH)_0.65]_2.00. IR spectrum of aleksandrovite is similar to that of baratovite, the strongest absorption strips are: 1083, 1024, 974, 950, 673, 607, 568, 520, 470, 440 cm^-1. Compatibility index is 1 – (Kp/Kc) = –0.005. The mineral is named to honour of the well-known Russian geochemist, geologist and mineralogist Stanislav Mikhailovich Aleksandrov (born in 1932) for his great contribution in geology, geochemistry and mineralogy of tin. The type specimen is stored in the Fersman Mineralogical Museum RAS in Moscow (registration number 3825/1). читать далее...

Chukanov N.V., Göttlicher J., Möckel S., Sofer Z., Van К.V., Belakovskiy D.I. Åskagenite(Nd), Mn2+NdAl₂Fe³⁺(Si₂O₇)(SiO₄)O₂ – a new mineral of the epidote supergroup, p. 17 - 22

A new epidote-supergroup mineral åskagenite-(Nd) was discovered in specimens from a granite pegmatite outcropped at the Åskagen deposit near the town of Filipstad, Värmland, Sweden, in association with potassic feldspar, quartz, bastnäsite, thorite, the Nd-dominant analogue of allanite-(Ce), brookite, gadolinite-(Y) and allophаne. The new mineral forms coarse prismatic and flattened crystals up to 1×4 cm in size. Åskagenite-(Nd) is black, with resinous lustre and brown streak, translucent in thin fragments; brittle, Mohs’ hardness 6, fracture conchoidal. D_meas = 3.737(5) g/cm³ (for a metamict sample); D_calc = 4.375 g/cm³ (for a sample heated at 600°C during 1 h in nitrogen). Åskagenite-(Nd) is optically isotropic, n = 1.712(2). IR spectrum is given. Chemical composition (electron microprobe, water determined by Alimarin method, Fe²⁺:Fe³⁺ by Mössbauer data, valency of Mn by XANES spectroscopic data, wt.%): CaO 0.27, Y₂O₃ 2.27, La₂O₃ 0.44, Ce₂O₃ 7.99, Pr₂O₃ 1.76, Nd₂O₃ 11.21, Sm₂O₃ 3.01, Yb₂O₃ 0.21, ThO₂ 0.72, MnO 7.98, FeO 7.75, Fe₂O₃ 9.16, Al₂O₃ 15.85, SiO₂ 29.51, H2O 0.55, total; 98.75. Crystalchemical formula: (Mn²⁺0.69Fe²⁺_0.26Ca_0.03)_∑0.98(Nd_0.41Ce_0.30Y_0.12Sm_0.10Pr_0.07La_0.02Yb_0.01Th_0.02)_∑1.05(Al_0.90Fe³⁺_0.10)_∑1.00Al_1.00(Fe³⁺_0.60Fe²⁺_0.40)_∑1.00Si_2.99O₁₁O[O_0.63(OH)_0.37]_∑1.00. Strong lines of X-ray powder-diffraction pattern of a heated sample d, Å (I; hkl) are: 3.50(46; -211), 3.22(50; -212, 201), 2.897 (100; -301), 2.850(73; 020), 2.687(73; 120), 2.121(48; -403), 1.630(59; 124). Unit-cell parameters are: a = 8.78(1) Å, b = 5.710(6) Å, c = 10.02(1) Å, b = 114.6(2)°; V = 456.7(8) Å3, Z = 2; space group P21/m. Type material is deposited in the collections of the Technische Universität, Bergakademie Freiberg, Germany; inventory numbers are 82194 and 82218. читать далее...

Stepanov V.А., Kungurova V.Е., Gvozdev V.I. Irarsite discovery in copper-nickel ores of Shanuch deposit (Kamchatka), p. 23 - 27

Journal/NDM45 2010 eng

Содержание

Summary

Editorial Board

Publishing group

Сontent

New Minerals and Their Varieties, New Finds of Rare Minerals, Mineral Paragenesis

Crystal Chemistry, Minerals as Prototypes of New Materials, Physical and Chemical Properties of Minerals

Mineralogical Museums and Collections

Personalities

Mineralogical Notes

Discussion