Journal/NDM57 2023 eng

New Data on Minerals, Volume 57, 2023

DEADLINES FOR ARTICLES

Issue 1 - March 31, 2023
Issue 2 - May 31, 2023
Issue 3 - August 31, 2023
Issue 4 - November 30, 2023

Editorial Board

Editor in Chief:
Plechov P.Yu. -D.Sc. in Geology and Mineralogy, Professor
Members of Editorial Board:
Pekov I.V. - Corresponding Member of the Russian Academy of Sciences
Garanin V.K. - D.Sc. in Geology and Mineralogy, Professor
Borutsky B.E. - D.Sc. in Geology and Mineralogy
Spiridonov B.E. - D.Sc. in Geology and Mineralogy
Chukanov N.V. - D.Sc. in Physical and Mathematical Sciences Kamenetsky V.S. - Professor (University of Tasmania)
Nenasheva S.N. - PhD in Geology and Mineralogy
Matvienko E.N. - PhD in Geology and Mineralogy
Generalov M.E. - PhD in Geology and Mineralogy
Pautov L.A. - Senior Researcher
Layout Designer
Kronrod E.V. - PhD in Chemistry

Content

Issue 1

Plechov P. Yu., Ushakova S.A., Shcherbakov V.D. Mineralogy and Genesis of Karites of the Murun Complex, p. 5-13

We studied mineralogy of the karite sample from Murun alkaline complex. Karite belongs to the silexites group and has so far been one of the few rocks of this family whose igneous genesis has not been questioned. The studied rock consists of quartz (73 vol. %), aegirine (4 vol. %), orthoclase (23 vol. %), and a number of accessory minerals, which are typical for fenites (narsarsukite, steacyite-turkestanite, delyite, etc.). Large euhedral quartz crystals with numerous oriented aegirine ingrowths create a formal resemblance to the porphyritic texture of effusive rocks, however, formation conditions of rock-forming minerals correspond to low temperature (<400℃). Possibly the rock was formed during the impregnation of a silica-rich fluid through a grorudite or aegirinite substrate. The study of karite of the Murun complex did not reveal any sign of the igneous genesis of these rocks. It can be concluded that karites, like many other representatives of the silexites family, are not magmatic, but of hydrothermal-metasomatic origin.
Keywords: Murun alkaline complex, silexites, quartz, steaciite, turkestanite, narsarsukite. читать далее...
Электронные приложения к статье : Plechov2023_Suppl.xlsx

Rumyantseva N.А., Berezin А.V., Vanshtein B.G., Skublov S.G. Clinopyroxene composition as an indicator of the conditions of crystallization of gabbroids from the Shaka Ridge (South Atlantic), p. 14-23

The paper presents the results of geochemical research (major, trace and rare earth elements) for clinopyroxene grains extracted from gabbro-type rocks of the Shaka Ridge, South Atlantic. The clinopyroxene belongs to the Ca–Mg–Fe type and is characterized by a smooth change in chemical composition from the center to the edge of the grains, expressed in a decrease in the magnesia value of Mg#, an increase in the total REE concentration and a more distinct manifestation of the negative Eu-anomaly. Based on the geochemical and morphological features of the grains, it is concluded that fractional crystallization significantly affects the composition of clinopyroxene during its formation. The estimation of P-T parameters by several methods allowed us to designate a narrow range of temperatures (1225–970 °C) and pressures (3–1 kbar) at which clinopyroxene crystallized.
Keywords: clinopyroxene, geochemistry, trace elements, REE, Shaka Ridge, South Atlantic. читать далее...

Spiridonov E.M., Devnina N.N., Murashko M.N., Korotaeva N.N., Kulikova I.M. Tungstenite and molybdenite as destruction products of ovamboite Cu20(Cu,Fe)6W2(Ge,As)6S32, tungsten-rich germanite, and maikainite Cu₂₀(Cu,Fe)₆Mo₂(Ge,As)₆S₃₂ of the Tsumeb deposit in Namibia, p. 24-29

The Vendian volcanogenic BSV type Ag-Zn-Cu-Pb Tsumeb deposit (Namibia, SW Africa) is uniquely rich in germanium minerals. Tsumeb hypothermal mineralization includes topaz, fluorapatite, quartz, K-feldspar, phlogopite, high chalcocite, pyrite, complex Ge sulphides enriched in W and Mo, namely, ovamboite Cu₂₀(Cu,Fe)₆W₂(Ge,As)₆S₃₂ and maikainite Cu₂₀(Cu,Fe)₆Мо₂(Ge,As)₆S₃₂; gallite – sphalerite – chalcopyrite solid solutions; complex Sn sulphides, such as stannoidite, and others. Tsumeb mesothermal mineralization includes chalcopyrite, chalcopyrite-bornite solid solution, bornite, high chalcocite, galena, Ga-rich sphalerite, tennantite, W-rich germanite, Zn-rich gallite, quartz, muscovite, dolomite, mawsonite, and others. Tsumeb epithermal mineralization is developed among brecciated early mineral aggregates. The parameters of formation of epithermal mineralization are T 240 – < 80 °C, solutions salinity is 6–12 wt.% equiv. NaCl. Galena, low-iron Cd sphalerite, tennantite, pyrite, low chalcocite, dolomite, and marcasite are abundant. Nonzonal, W-poor germanite, gallite, and renierite are widely developed. There are destruction products of high-temperature Ge sulphides enriched in W and Mo. The destruction products of ovamboite and W-rich germanite are abundant microveinlets and small (up to 15 µm) nests of tungstenite, low chalcocite, betechtinite, siderite, and calvertite. The destruction products of maikainite are intergrowths of the smallest molybdenite plates with low chalcocite and betechtinite. Tungstenite contains < 0.3 wt.% of Mo, molybdenite ~ 0.3 wt.% of W, which indicates their low formation temperature. The probable decomposition reaction of ovamboite (the mineral composition is close to real): Cu₂₄Fe₂W₂Ge₄As₂S₃₂ + 2 Cu₂S + 2 Pb sol. → WS₂ (tungstenite) + Cu₈WS₆ (calvertite) + Cu₂₀FePb₂S₁₅ (betechtinite) + FeS₂ (pyrite) + 4 Ge sol. + As₂S₃ sol. + 6 S sol. The probable decomposition reaction of maikainite (the mineral composition is close to real): Cu₂₄Fe₂Мо₂Ge₄As₂S₃₂ + 2 Pb sol. → 2 МоS₂ (molybdenite) + Cu₂₀FePb₂S₁₅ (betechtinite) + 2 Cu₂S (low chalcocite) + FeS₂ (pyrite) + 4 Ge sol. + 2 As₂S₃ sol.+ 3 S sol.
Keywords: tungstenite, molybdenite, calvertite, betechtinite, ovamboite, maikainite, W-rich germanite, the Tsumeb volcanogenic deposit BSV type. читать далее...

Issue 2

Borisova E.A. Margarita Ivanovna Novgorodova – director of the Fersman Mineralogical Museum (1996–2010), p. 31-41

In the paper the activity of Professor Margarita Ivanovna Novgorodova is presented. She was a director of the Fersman Mineralogical Museum in the country’s difficult time and managed not only to save the Museum but also essentially developed the scientific and museum activities.
Keywords: Fersman Mineralogical Museum, collection of minerals, museum exposition, M.I. Novgorodova. читать далее...
Электронные приложения к статье : Novgorodova2023_Supplementary.pdf

Generalov M.E., Agakhanov A.A. Precios Grains of History. PGE Minerals from Specimens of A.V. Stenbock-Fermor, p. 42-51

In 1907 specimens from placers and ore veins of the Upper Iset mining district of the Urals came to the Museum's collection from Count A.V. Stenbock-Fermor. By themselves, these materials are evidence of the long mining history of the Urals, the participation of various Russian social strata up to the highest aristocracy in mining industry. Comparison of historical and geographical data made it possible to clarify the localities of samples. The analysis of the PGE minerals showed that they are mainly represented by Fe-Pt and Os-Ir-Ru alloys. Despite the fact that in the museum the samples of Stenbock-Fermor platinoids are recorded as "osmic iridium", a very common mineral in this collection is ruthenium. Osmium prevails, single grains of osmic and platinum iridium found. Irarsite, laurite, Ir-Fe-Ni alloys also present in the association.
Keywords: Mineralogical Museum, collection, placers, Ural, minerals, PGE, history. читать далее...

Sokolova E.L., Pekova N.A. Agates of Idzhevan (Armenia) in the collection of the Fersman Mineralogical museum RAS, p. 52-61

Several deposits of the high quality agates are located in the Idzhevan district of the north-east of Armenia. The main agate-bearing rocks are metamorphosed pyroxene porphyrites of the upper Cretaceous volcanogenic-sedimentary complex. Agates in volcanogenic rocks are formed under influence of low-grade metamorphism processes in conditions of the Zeolite facies. Idzhevan agates and chalcedonies are represented rather sparsely in the museum collection – by 46 specimens. Almost half of them are mossagates, containing abundant inclusions of celadonite. Several specimens from V.I. Stepanov's collection “A”, included into the main museum's fund, are interesting because of their composition and genesis. Agates, containing blue to amethyst-purple chalcedony and motley “bottom” jasper are especially attractive. There are several specimens of concentric-zonal agates consisting of grey chalcedony, often with quartzine, quartz/amethyst, calcite, goethite in the collection. There are also 4 landscape Idzhevan agate miniatures by stone artist A.N. Korobkov. Agates/chalcedonies from any other locations of Armenia are represented by only 6 specimens. Mineral diversity of Idzhevan agates is underrepresented in the museum collection. Variegated landscape and “carpet” agates are almost completely absent. The museum hopes that the collections will be filled with such kind of specimens from interested researchers, collectors and stone amateurs.
Keywords: Idzhevan deposits of agates, low-grade metamorphism, agate/chalcedony genesis in metavolcanites, Armenian agates collection of the museum, mossagate, chalcedony, celadonite, quartzine, calcite, goethite, clinoptilolite, landscape agate. читать далее...

Issue 3

Gritsenko Yu.D., Ogorodova L.P., Vigasina M.F., Dedushenko S.K., Vyatkin S.V., Melchakova L.V., Ksenofontov D.A. Physicochemical characteristics of iron-bearing lazulite from granitic pegmatites of the Patom Highlands, Irkutsk Region, p. 63-73

ILazulite of the composition (Mg_0.87Fe²⁺_0.13Ni_0.01Sr_0.01)(Al_1.97Fe³⁺_0.03)(PO₄)_2.03(OH)_1.95 has been studied by thermal and electron probe analysis, powder X-ray diffraction, IR, Raman, ESR and Mössbauer spectroscopy. The enthalpy of formation of lazulite (Mg_0.9Fe²⁺_0.1)Al_2.0(PO₄)_2.0(OH)_2.0 from the elements ∆_fH⁰(298.15 K)= − 4472.5 ± 3.1 kJ/mol. The value of its absolute entropy S0(298.15 K) = 207 ± 3 J/(mol·K) was estimated, the entropy of formation ∆_fS⁰(298.15 K) = −1120 ± 3J/(mol·K) and the Gibbs energy of formation from the elements ∆_fG⁰(298.15 K) = −4138.7 ± 3.2 kJ/mol. The values of the enthalpy and Gibbs energy of formation from the elements of the magnesium member of the isomorphic series lazulite – scorzalite of the composition MgAl_2.0(PO₄)_2.0(OH)_2.0 are estimated as −4492.7 ± 3.1 and −4157.6 ± 3.2 kJ/mol, respectively.
Keywords: lazulite, X-ray powder diffraction, IR spectroscopy, Raman spectroscopy, ESR spectroscopy, Mössbauer spectroscopy, thermal analysis, Calve microcalorimetry, enthalpy, entropy, Gibbs energy. читать далее...
Электронные приложения к статье : Gritsenko_1_2023-3_rus.pdf

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