Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033 Russia b Sobolev Institute of Geology and Mineralogy...Mineralogy, pr. Koptyuga 3, Novosibirsk, 630090 Russia Received February 24, 2010 Abstract—Quartz–albite–microcline...boundary of Irkutsk oblast and Buryatia (Eastern Sayan, middle reaches of the Kitoi River) were formed...and concomitant mineraliza tion are known from Russia, Nigeria, South America, and Canada. The raremetal...boundary of Irkutsk oblast and Buryatia (Eastern Sayan, middle reaches of the Kitoi River). The metasomatic |