AM_Anorthoclase_2 Formula: (Al Si3) (Na.75 K.25) O8 Name: Anorthoclase Unit cell: 8.252 12.936 7.139 92.11 116.32 90.22 , V=682.43 Space group: C-1 (2)

Harlow G E , American Mineralogist , 67 (1982) p.975-996, The anorthoclase structures: The effects of temperature and composition, Mt. Gibele, Or = 22.3, T = 23 deg C, feldspar