Marialite

Marialite is a silicate mineral with a chemical composition of Na₄Al₃Si₉O₂₄Cl if a pure endmember or Na₄(AlSi₃O₈)₃(Cl₂,CO₃,SO₄) with increasing meionite content. Marialite is a member of the scapolite group and a solid solution exists between marialite and meionite, the calcium endmember. It is a rare mineral usually used as a collector's stone. It has a very rare but attractive gemstones and cat's eye.