Marialite
Marialite is a silicate mineral with a chemical formula of Na4Al3Si9O24Cl[5][6] if a pure endmember or Na4(AlSi3O8)3(Cl2,CO3,SO4) with increasing meionite content.[3] Marialite is a member of the scapolite group and a solid solution exists between marialite and meionite, the calcium endmember.[3] It is a rare mineral usually used as a collector's stone.