Banalsite

Banalsite is a rare barium, sodiumaluminiumsilicate 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.

It was first described in 1944 for an occurrence in the Benallt Mine, Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd (Caernarvonshire), Wales. The name is derived from the chemical symbols of its composition. It has also been reported from Långban, Värmland, Sweden and from the Kalahari manganese field, Cape Province, South Africa. It has recently been reported from the nepheline syenites of the , Eastern Sayan, Siberia, Russia; the complex of alkaline rocks and carbonatites, Superior Alkaline Province, northwestern Ontario, Canada; the Pilansberg peralkaline complex, South Africa; the Sakharjok alkaline complex in the Kola Alkaline Province, Kola Peninsula of northwestern Russia (the Gremyakha–Vyrmes peralkaline complex, and the Turiy Mys complex of ultramafic–alkaline rocks and carbonatites).