In the beginning of August 1990, an alkaline granitic pegmatite was found by G.S. Ripp on the Northern slope of Mount Ulyn Khuren. It was given the name "Pseudomorphosed" after its enrichment in well-formed pseudomorphoses after an unknown REE-rich (up to 30% REE2O3) eudialyte group mineral.
In the middle of August 1990 a similar but smaller pegmatite was found by P.M. Kartashov in some hundreds m to the east. It obtained the name "Neprimetnyi" (Indiscernible) because of its size and position on mountain slope.
Both pegmatites contain apoeudialyte pseudomorphoses with ferriallanite-(Ce) as one of its main constituents. And both are TL for this mineral.
Pegmatites were produced by intrusion of rare metal alkaline granites of the V intrusive phase and crosscut coarsegrained nordmarkites of the the I intrusive phase of massif.
Mineral List
18 entries listed. 17 valid minerals.
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