Cernit Pearl is a premium modeling clay produced in Belgium by The Clay and Paint Factory. The Pearl line of Cernit polymer clay has a very high mica content, is based on the Translucent line, and tends to be soft when very fresh.
A great review of Cernit Pearl polymer clay can be found here - Cernit Pearl – The Sparkly Polymer Clay.
Note - the review was written using clay that was only a few days off the production line and needed leaching to be workable. Current stock will not be that soft.