Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1127/ejm/2015/0027-2438

Ключевые слова: ferro-pedrizite, new mineral, amphibole supergroup, lithium amphibole, Sutlug pegmatite, crystal structure, Mossbauer

Аннотация: Ferro-pedrizite, a new amphibole-supergroup mineral was discovered in the Sutlug pegmatite occurrence situated in the Targi River Basin, Tyva Republic, Eastern Sibera, Russia. The associated minerals are quartz, albite, microcline, spodumene, cassiterite, beryl, columbite-(Mn), fergusonite-beta-(Y), fluorapatite, schorl, trilithionite and fluorite. Ferro-pedrizite forms dark grey-blue to violet-blue acicular and long prismatic crystals up to 2 x 5 x 50 mm and their aggregates. D-meas = 3.16(1) g/cm(3) (by hydrostatic weighing), 3.13(1) g/cm(3) (by flotation in heavy liquids); D-calc = 3.135 g/cm(3). Ferro-pedrizite is optically biaxial (-), alpha = 1.614(3), beta = 1.638(3), gamma = 1.653(3), 2V(meas) = 75(5)degrees, 2V(calc) = 76 degrees. The infrared spectrum is given. The chemical composition is (EDS-mode electron microprobe, the ratio Fe2+:Fe3+ by Miissbauer data, Li by ICP-MS, H2O by gas chromatography of ignition products, F by wet analysis, wt. %): Li2O 4.67, Na2O 2.54, K2O 0.13, MgO 4.48, CaO 0.29, MnO 0.59, FeO 9.06, Al2O3 13.13, Fe2O3 4.60, SiO2 57.59, F 1.15, H2O 1.50, -O = F-0.48, total 99.25. The empirical formula based on 24 anions is: (Na0.60K0.02)(Sigma 0.62)(Li1.89Na0.07Ca0.04)(Sigma 2.00)(Fe1.032+Mg0.90Mn0.072+Al1.88Fe0.473+Li0.65)(Sigma 5.00)[(Si7.79Al0.21)(Sigma 8.00)O-22](OH)(1.36)F0.49O0.15)]. The simplified formula is NaLi2(Fe22+Al2Li)Si8O22(OH)(2). Ferro-pedrizite is monoclinic, C2/m, a = 9.3716(4), b = 17.649(1), c = 5.2800(6) angstrom, beta = 102.22(1)degrees, V = 853.5(1) angstrom(3), Z = 2. The structure has been refined to R-obs = 3.9 % (4843 I> 2 sigma I). A twinning model was introduced into the refinement through the matrix [-1 0 0/0-1 01-0.7516 0 1] with the ratio of two twin components of 0.681(3)10.319(3). The strongest lines of the powder X-ray diffraction pattern [d, angstrom (I, %) (hkl)] are: 8.147 (52) (110), 4.420 (22), (040), 3.009 (100) (310), 2.7102 (28) (330), 2.6865 (29) (151), 2.6236 (21) (461). Type material is deposited in the Mineralogical Museum of the Tomsk State University, Tomsk, Russia.

Журнал: EUROPEAN JOURNAL OF MINERALOGY

Выпуск журнала: Vol. 27, Is. 3

Номера страниц: 417-426

ISSN журнала: 09351221

Место издания: STUTTGART

Издатель: E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG

• Konovalenko Sergey I. (Tomsk State Univ, Tomsk 634050, Russia)
• Ananyev Sergey A. (Siberian Fed Univ, Krasnoyarsk 660041, Russia)
• Chukanov Nikita V. (Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia)
• Aksenov Sergey M. (Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia; St Petersburg State Univ, Dept Crystallog, St Petersburg 199034, Russia)
• Rastsvetaeva Ramiza K. (Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia)
• Bakhtin Anatoliy I. (Kazan Fed Univ, Kazan 420008, Russia)
• Nikolaev Anatoliy G. (Kazan Fed Univ, Kazan 420008, Russia)
• Gainov Ramil R. (Kazan Fed Univ, Kazan 420008, Russia; Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany; Helmholtz Zentrum Berlin Mat & Energie, D-14109 Berlin, Germany)
• Vagizov Farit G. (Kazan Fed Univ, Kazan 420008, Russia)
• Sapozhnikov Anatoliy N.
• Belakovskiy Dmitriy I.
• Bychkova Yana V.
• Klingelhoefer Goestar (Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany)
• Blumers Mathias (Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany)

• Web of Science Core Collection