Natrosilite : liliac Color 11.30 x 11.30 x 6.48 mm Russia y99916
Is a Sodium silicate with formula Na2Si2O5 and hardness of 2.5.
Must be handle with care because is water soluble. So the cutting and polishing has been very difficult for this material not available in the market as cut gem.
Is is found in the Kedykvekpakh mount ,Lovozero Kola Peninsula, Russia