Banalsite is a rare barium, sodium aluminium silicate mineral with formula: BaNa2Al4Si4O16. Banalsite is a tectosilicate of the feldspar group. Banalsite and its strontium analogue, (SrNa2Al4Si4O16), constitute a complete solid solution series. In addition limited solid solution with calcium exists between these and : CaNa2Al4Si4O16.