AM_Anorthoclase_5 Formula: (Al Si3) (Na.85 K.15) O8 Name: Anorthoclase Unit cell: 8.321 12.969 7.148 90.0 116.05 90.0 , V=693.01 Space group: C12/M1 (12)

Harlow G E , American Mineralogist , 67 (1982) p.975-996, The anorthoclase structures: The effects of temperature and composition, Kakanui, Or = 13.8, T = 750 deg C, feldspar