AM_Anorthite_5 Formula: Si2 Al2 Ca O8 Name: Anorthite Unit cell: 8.175 12.873 14.17 93.11 115.89 91.28 , V=1337.80 Space group: P-1 (2)

Angel R J , Carpenter M A , Finger L W , American Mineralogist , 75 (1990) p.150-162, Structural variation associated with compositional variation and order-disorder, behavior in anorthite-rich feldspars, sample from Val Pasmeda