Тип публикации: статья из журнала
Год издания: 2015
Идентификатор DOI: 10.1007/s00269-015-0766-5
Ключевые слова: New mineral, Rossovskyite, Structure, Granite-pegmatite, Mongolia, Brittle fracture, Crystal chemistry, Crystal structure, Garnets, Granite, Iron oxides, Manganese, Manganese oxide, Mica, Minerals, Niobium, Phosphate minerals, Silicate minerals, Single crystals, Stretching, Structure (composition), Titanium, Tungsten, X ray diffraction, Chemical compositions, Crystal chemical formula, Powder X ray diffraction, Single crystal x-ray diffraction, Stretching vibrations, Tantalum, pegmatite, physical property, Altai Mountains
Аннотация: A new mineral rossovskyite named after L.N. Rossovsky was discovered in granite pegmatites of the Bulgut 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. RossovsПоказать полностьюkyite forms flattened anhedral grains up to 6 x 6 x 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 Mossbauer spectrum, the ratio Fe2+:Fe3+ is 35.6:64.4. The chemical composition is as follows (electron microprobe, Fe apportioned between FeO and Fe2O3 based on Mossbauer data, wt%): MnO 1.68, FeO 5.92, Fe2O3 14.66, TiO2 7.69, Nb2O5 26.59, Ta2O5 37.51, WO3 5.61, total 99.66. The empirical formula calculated on four O atoms is: Ti0.25Nb0.51Ta0.43W0.06O4. The crystal structure was determined 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) a"
Журнал: PHYSICS AND CHEMISTRY OF MINERALS
Выпуск журнала: Vol. 42, Is. 10
Номера страниц: 825-833
ISSN журнала: 03421791
Место издания: NEW YORK
Издатель: SPRINGER