KAINOSITE-(Y) IN VEINED SYENITES OF THE PENYZEVYCHI QUARRY (KOROSTEN PLUTON, UKRAINE)
Keywords:
kainosite-(Y), yttrium minerals, syenite, Korosten pluton, Ukrainian shield.Abstract
Rare-earth minerals represented by Y-REE-silicocarbonate, xenotime-(Y), bastnaesite-(Ce), allanite-(Ce), unidentified Y- and Y-Ti-Ca-silicates have been discovered in veined syenites among ilmenite norites in the Penyzevychi quarry (Malyn district, Zhytomyr region). The Y-REE-silicocarbonate kainosite-(Y) Ca2(Y,Ce)2Si4O12(CO3)·H2O – a rather rare mineral – has been diagnosed in crystalline rocks of Ukraine for the first time. Kainosite-(Y) from Penyzevychi quarry differs from typical mineral from the other massifs by exceptionally increased FeO con-tent. Increased or high FeO content is due to a thin (dispersed) micro-nanosize Fe-phase (< 1 μm). Decreasing of Si, Ca, Y and REE in mineral composition in comparison with the typi-cal kainosite-(Y) is due to increased FeO content. This makes it difficult to diagnose.
References
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