В правом борту долины реки Кукурт на Восточном Памире (ГБАО, Таджикистан) найден кристалл бран- нерита UTi2O6 массой 44.5 г. Минерал метамиктный. После прокаливания дает рентгенограмму смеси браннерита, рутила и U3O8. Химический состав браннерита (среднее по 10 микрозондовым анализам) рассчитывается на формулу (O = 6): (U+40.68U+60.13Y0.07Th0.05Ce0.01Gd0.01Dy0.01Yb0.01Ca0.01)0.98(Ti1.89Fe+3 0.13)2.02O6. Плотность 5.40(5) г/см3. В отраженном свете светло-серый с умеренной отражательной способностью (приведен спектр отражения). Минерал изотропен в силу своей метамиктности. Рефлексы в воздухе красно-коричневые. Микротвердость VHN 674. Приведены рамановские спектры браннерита и продук- тов его изменения. Кратко описаны продукты замещения браннерита. A crystal of brannerite UTi2O6 weighing 44.5 g was found on the right side of the Kukurt River in the Eastern Pamir (Gorno-Badakhshan, Tajikistan). The mineral is metamict. It gives an X-ray diffraction pattern of a mixture of brannerite, rutile and U3O8after annealing. The chemical composition of brannerite (average over 10 microprobe analyzes) is calculated on O = 6 apfu on the formula (U+40.68U+60.13Y0.07Th0.05Ce0.01Gd0.01Dy0.01Yb0.01Ca0.01)0.98(Ti1.89Fe+30.13)2.02O6. Density (meas.) 5.40(5) g/cm3. In reflected light it is light gray with moderate reflectivity (reflectance spectrum is given). The mineral is isotropic due to its metamict nature. Reflections in the air are red-brown. Microhardness VHN = 674. Raman spectrums of brannerite and its alteration products are given. The substitution products of brannerite are described briefly.
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