AM_Feldspar_20 Formula: Pb.5 (Si.71 Al.29) O2 Name: Feldspar Unit cell: 8.448 13.057 7.166 90.0 115.25 90.0 , V=714.93 Space group: C12/M1 (12)

Benna P , Tribaudino M , Bruno E , American Mineralogist , 84 (1999) p.120-129, High-temperature in situ structural investigation on lead feldspar, Sample at T = 700 C, split Pb atom model