AM_Feldspar_29 Formula: (Ca.2 Sr.8) Si2 Al2 O8 Name: Feldspar Unit cell: 8.379 12.971 14.278 90.11 115.48 90.06 , V=1400.85 Space group: I-1 (2)

Benna P , Bruno E , American Mineralogist , 88 (2003) p.1532-1541, Single-crystal in situ high-temperature structural investigation of the I-1 - I2/c phase, transition in Ca0.2Sr0.8Al2Si2O8 feldspar, T = 500 C