AM_K133Na67Si2O5 Formula: K4 Na2 Si6 O15 Name: K1.33Na.67Si2O5 Unit cell: 19.6816 7.2656 12.571 90.0 117.82 90.0 , V=1589.86 Space group: C12/C1 (15)

Spek A L , Jong B H W S , Acta Crystallographica, Section E , 61 (2005) p.i188-i190, Potassium sodium phyllosilicate, K1.33Na0.67Si2O6