is a Hydrated sodium aluminun silicate with formula Na2Al2Si3O10-2H2O and hardness of 5-5.5.
It belogn to the zeolite series very close with scolecite and mesolite. The crystals formation is always a spray of needles,when in cluster with radiating structures.
Not many stones in the market and therefore is considered a rare gem.
From Mt. Yukspor,Khibiny,Kola Peninsula,Russia.