AM_Anorthite_4 Formula: Ca Si2 Al2 O8 Name: Anorthite Unit cell: 8.042 12.748 13.964 92.2 115.27 92.65 , V=1290.52 Space group: I-1 (2)

Angel R J , American Mineralogist , 73 (1988) p.1114-1119, High-pressure structure of anorthite, Sample: P = 31 kbar