AM_Feldspar_18
Formula: Pb.5 (Si1.42 Al.58) O4
Name: Feldspar
Unit cell: 8.422 13.045 14.31 90.0 115.34 90.0 , V=1420.90
Space group: I12/C1 (15)

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 = 230 C, split Pb atom model