Double-layered polymorphs of MAl2Si2O8 (M=Ba, Ca) and aluminosilicate melt structure Simakin, A. ; Salova, T. ; Kucherinenko, Ja. Abstract Publication: Geochimica et Cosmochimica Acta Supplement Pub Date: June 2009 Bibcode: 2009GeCAS..73R1225S