AM_Dmisteinbergite
Formula: Ca (Al2 Si2) O8
Name: Dmisteinbergite
Unit cell: 5.1 5.1 14.72 90.0 90.0 120.0 , V=331.57
Space group: P63/MCM (193)

Takeuchi Y , Donnay G , Acta Crystallographica , 12 (1959) p.465-470, The crystal structure of hexagonal CaAl2Si2O8