Typomorphism and sources of titanium and niobium minerals of Ichetju, Middle Timan. <...> The Pizhemsкy titanium dероsit (Middle Timan): geology and development aspects. <...> Rutile and its applications in earth science. <...> Columbite-tantalite, rutile and other accessory minerals from the St. <...> Understanding the effect of surface/bulk defects on the photocatalytic activity of TiO2: anatase versus rutile. <...> 2; e-mail: via@spmi.ru Описана новая находка цинковой шпинели—ганита в биотитовых метасоматитах Верхнеурмийского медь-вольфрам-оловорудного узла в Приамурье. <...> Исследован состав, парагенезисы ганита и его место в истории развития гидротермальных процессов района. <...> Сделан вывод, что ганит может служить минералом-индикатором редкометалльно-метасоматических процессов. <...> GAHNITE IN RARE-METAL METASOMATITES OF THE VERKHNEURMIYSKY ORE CLUSTER (AMUR RIVER REGION) Saint Petersburg Mining University, Saint Petersburg, Russia The new finding of zinc-bearing spinel—gahnite in biotite metasomatites of the Verkhneurmiysky copper-tungsten-tin ore cluster has allowed to study composition of this mineral, its paragenesis and position in evolution of hydrothermal processes in the district. <...> Gahnite of rare-metal ore occurrences contains significant isomorphous admixtures of iron (24.3 %) and manganese (0.65 %), it belongs to the hercynite—gahnite—franclinite series. <...> Gahnite occurs typically in biotite-microcline metasomatites of the lower («sub-ore») stage of greisen metasomatic column located in the proximate exo-contact of rare-metal granite massif. <...> On the base of obtained results and published data, there is displayed hypothesis of appearance of zinc in the early post-magmatic solutions of some rare-metal ore-magmatic systems. <...> This means the conclusion than gahnite may be considered as the mineral-indicator for rare-metal-metasomatic processes. <...> Key words: gahnite, zinc-bearing hercynite, siderophyllite, lithium-fluoric granite, greisen, zwitter, tungsten-tin ore deposits, Far East, Amur River region. <...> Выявленные <...>