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Polyakovite-(Ce), Fluororichterite


Polyakovite-(Ce) : (Ce,Ca)4(Mg,Fe2+)(Cr3+,Fe3+)2(Ti,Nb)2[O4|Si2O7]2, Fluororichterite : Na[CaNa][Mg5][(F,OH)2|Si8O22]

Photo Copyright © Pavel M. Kartashov collection & photo  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: Pit No. 97 (N97 Mine), Ilmen Natural Reserve, Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia
Back side of the largest known polyakovite-(Ce) crystal showing conchoidal surfaces so typical for this mineral. Green fluororichterite owergrowth is well visible. Specimen size is 4.5x3x2.5 cm and its radioactivity 146 μR/h. Collected by Ivan Klochkov in 2003. Pavel M. Kartashov collection (#2103) and photo.

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