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Konovalenko, S. I.
Ananyev, S. A.
Chukanov, N. V.
Rastsvetaeva, R. K.
Aksenov, S. M.
Baeva, A. A.
Gainov, R. R.
Vagizov, F. G.
Lopatin, O. N.
Nebera, T. S.
2017-06-16T10:28:13Z
2017-06-16T10:28:13Z
2015-11
Konovalenko, S. I. A new mineral species rossovskyite, (Fe 3+ ,Ta)(Nb,Ti)O 4 : crystal chemistry and physical properties [Текст] / S. I. Konovalenko, S. A. Ananyev, N. V. Chukanov, R. K. Rastsvetaeva, S. M. Aksenov, A. A. Baeva, R. R. Gainov, F. G. Vagizov, O. N. Lopatin, T. S. Nebera // Physics and Chemistry of Minerals. — 2015. — Т. 42 (№ 10). — С. 825-833
03421791
http://elib.sfu-kras.ru/handle/2311/33082
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Abstract A new mineral rossovskyite named after L.N. Rossovsky was discovered in granite pegmatites of the Bul- gut occurrence, Altai Mts., Western Mongolia. Associated minerals are microcline, muscovite, quartz, albite, garnet of the almandine–spessartine series, beryl, apatite, triplite, zircon, pyrite, yttrobetafite-(Y) and schorl. Rossovskyite forms flattened anhedral grains up to 6 × 6 × 2 cm. The color of the mineral is black, and the streak is black as well. The luster is semi-metallic, dull. Mohs hardness is 6. No cleavage or parting is observed. Rossovskyite is brittle, with uneven fracture. The density measured by the hydrostatic weighing method is 6.06 g/cm 2 , and the density calculated from the empirical formula is 6.302 g/cm 3 . Rossovskyite is biaxial, and the color in reflection is gray to dark gray The IR spectrum contains strong band at 567 cm −1 (with shoulders at 500 and 600 cm −1 ) corresponding to cation– oxygen stretching vibrations and weak bands at 1093 and 1185 cm −1 assigned as overtones. The reflection spectrum in visible range is obtained. According to the Mössbauer spectrum, the ratio Fe 2+ :Fe 3+ is 35.6:64.4. The chemical composition is as follows (electron microprobe, Fe appor- tioned between FeO and Fe 2 O 3 based on Mössbauer data, wt%): MnO 1.68, FeO 5.92, Fe 2 O 3 14.66, TiO 2 7.69, Nb 2 O 5 26.59, Ta 2 O 5 37.51, WO 3 5.61, total 99.66. The empirical formula calculated on four O atoms is: Mn 2+ 0.06 Fe 2+ 0.21 Fe 3+ 0.47 Ti 0.25 Nb 0.51 Ta 0.43 W 0.06 O 4 . The crystal structure was deter- mined using single-crystal X-ray diffraction data. The new mineral is monoclinic, space group P2/c, a = 4.668(1), b = 5.659(1), c = 5.061(1) Å, β = 90.21(1)º; V = 133.70(4) Å 3 , Z = 2. Topologically, the structure of rossovskyite is analogous to that of wolframite-group minerals. The crystal-chemical formula of rossovskyite is [(Fe 3+ , Fe 2+ , Mn) 0.57 Ta 0.32 Nb 0.11 ][Nb 0.40 Ti 0.25 Fe 0.18 Ta 0.11 W 0.06 ]O 4 . The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are as follows: 3.604 (49) (110), 2.938 (100) (−1−11), 2.534 (23) (002), 2.476 (29) (021), 2.337 (27) (200), 1.718 (26) (−202), 1.698 (31) (−2−21), 1.440 (21) (−311). The type specimen of rossovskyite is deposited in the Mineralogical Museum of the Tomsk State University, Tomsk, 634050 Russia, with the inventory number 20927.
http://istina.msu.ru/publications/article/11685409/
New mineral
Rossovskyite
Structure
Granite-pegmatite
Mongolia
A new mineral species rossovskyite, (Fe 3+ ,Ta)(Nb,Ti)O 4 : crystal chemistry and physical properties
Journal Article
Published Journal Article
825-833
38.35.21
2017-06-16T10:28:13Z
10.1007/s00269-015-0766-5
Институт горного дела, геологии и геотехнологий
Кафедра геологии, минералогии и петрографии
Physics and Chemistry of Minerals
Q2


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