Polyakovite-(Ce)

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.

© Pavel M. Kartashov collection & photo

The largest known up to now terminated crystal of Polyakovite-(Ce) - 4.5x3x2.5 cm size. It associated with Phlogopite and Fluororichterite, contain inclusions of Thorianite and high-thorian Fergusonite-(Ce) and -(Y). Its radioactivity is 146 μR/h. Collected by Ivan Klochkov in 2003. Pavel M. Kartashov collection (#2103) and photo.

© Pavel M. Kartashov collection & photo

Termination of short-prismatic polyakovite-(Ce) crystall of 1x3 mm size. Pavel M. Kartashov collection (#2103) and photo.

© Pavel M. Kartashov collection & photo

© Dmitry Tonkacheev

Black aggregate of polyakovite-(Ce) with typical conchoidal fracture surfaces. Collected by Mikhail Murashko in the 1990s. Purchased from Sergey Vasiliev in 2021.

© Andrew Hodgson