AM_Celsian
Formula: Ba (Al2 Si2) O8
Name: Celsian
Unit cell: 8.622 13.078 14.411 90.0 115.1 90.0 , V=1471.52
Space group: I12/C1 (15)

Griffen D T , Ribbe P H , American Mineralogist , 61 (1976) p.414-418, Refinement of the crystal structure of celsian