Journal/NDM59 2025 eng

New Data on Minerals, Volume 59, 2025

DEADLINES FOR ARTICLES

Issue 1 - March 31, 2025
Issue 2 - May 31, 2025
Issue 3 - August 31, 2025
Issue 4 - November 30, 2025

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

Pautov L.A., Shodibekov M.A., Makhmadsharif S. Discovery of tainiolite in the carbonatites of the Dunkeldyk massif, Eastern Pamirs, p. 5-12

Taeniolite, KLiMg₂Si₄O₁₀F₂, was discovered in a strontium-rich carbonatites of the Cenozoic subvolcanic potassium alkaline complex of Dunkeldyk (37^о46'50N, 74^o59'37E), Eastern Pamir, Gorno-Badakhshan Autonomous Oblast, Tajikistan. Taeniolite occurs as light-brown lamellar grains up to 3 mm in diameter and up to 0.4 mm in thick in a rock, which consists of calcium strontianite (Sr_0.54Ca_0.46)CO₃, fluorite, Sr-bearing calcite, strontianite, Sr-bearing fluorapatite, barite, amphibole group member, which close to magnesio-fluoro-arfvedsonite, aegirine, cancrinite group mineral, ankylite-(Ce) and pyrite. Taeniolite is optically biaxial (–), 2V = 5–10(2)^o. Refractive indices of the mineral are: n_g = n_m = 1.547(2), n_p= 1.524(2). Taeniolite from the Dunkeldyk massif is characterized with lithium content close to theoretical and extreme fluorine amount. Chemical analysis by electron microprobe (7 points) and LA-ICP-MS for Li gave SiO₂ 58.98, TiO₂ 0.09, Al₂O₃ 0.23, FeO 0.51, MnO 0.12, MgO 19.89, K₂O 11.28, Na₂O 0.38, Li₂O 3.65, F 9.24, H₂O 0.07, total 104.44; –O=F₂ –3.88; total 100.57 wt%. The empirical formula, based on 10 O apfu is: (K_0.97Na_0.05)_1.02(Li_0.97Mg_0.03)_1.00(Mg_1.97Fe_0.03Mn_0.01)_2.01(Si_3.97Al_0.02Ti_0.01)_4.00O₁₀[F_1.97(OH)_0.03]₂. The main absorption bands in the IR spectrum of taeniolite (cm^–1): 1129, 967, 721, 497, 383. In the Raman spectrum, strong lines (cm^–1): 184, 258, 295, 307, 334, 701, 956, 1146. X-ray powder pattern of taeniolite is given. Apparently, this is the first discovery of a lithium mineral in the Dunkeldyk carbonatites.
Keywords: minnesotaite, ferrohortonolite-fayalite plagiogranites, Castel Mountain, Mountain Crimean mesozoids. читать далее...

Gritsenko Yu.D., Ogorodova L.P., Vigasina M.F., Dedushenko S.K., Ksenofontov D.A., Melchakova L.V. Staurolite from staurolite-almandine-muscovite schists of the Patom Highland (Mamsko-Chuisky District, Irkutsk Region): a comprehensive physicochemical study, p. 13-24

The article presents the results of a comprehensive physicochemical study of staurolite from staurolite-almandine-muscovite schists of the Patom Highland of the Mama-Chuisky District (Irkutsk Region) using powder X-ray diffraction, electron probe microanalysis, IR, Raman and Mössbauer spectroscopy. The chemical formula of the mineral is (Fe²⁺_1.7Mg_0.3)(Al_8.9Mg_0.1)(Si_3.9Al_0.1)O_22.8(OH)_1.2. The enthalpy of formation of the studied staurolite from the elements was determined for the first time using high-temperature melt solution calorimetry on a Calvet microcalorimeter (– 11998 ± 11 kJ/mol). The value of its standard entropy was estimated and the value of the Gibbs energy of formation was calculated: 489.8 ± 2.1 J/(mol K) and −11271 ± 11 kJ/mol, respectively. The thermodynamic constants for staurolite of the idealized composition Fe²⁺₂Al₉Si₄O₂₃(OH) were calculated: Δ_fH⁰(298.15 K) = − 11943 ± 12 kJ/mol, Δ_fG⁰(298.15 K) = − 11222 ± 12 kJ/mol .
Keywords: staurolite, Mamsko-Chuisky district, Patom Highland, Calvet microcalorimetry, enthalpy of formation, entropy, Gibbs energy, IR spectroscopy, Raman spectroscopy, Mössbauer spectroscopy. читать далее...

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