Formula: (K.65 Na.35) (Si3 Al) O8
Name: Sanidine
Unit cell: 8.558 12.997 7.179 90.0 116.07 90.0 , V=717.27
Space group: C12/M1 (12)

Keefer K D , Brown G E , American Mineralogist , 63 (1978) p.1264-1273, Crystal structure and composition of sanidine and high albite in cryptoperthitic, intergrowth, Note this sample of feldspar is from the, Rabb Canyon pegmatite, Grant County, New Mexico, USA