AM_Feldspar_2
Formula: (Si2.82 Al1.18) (K.59 Na.22 Ba.19) O8
Name: Feldspar
Unit cell: 8.516 13.023 7.206 90.0 115.9 90.0 , V=718.90
Space group: C12/M1 (12)

Viswanathan K , Brandt K , American Mineralogist , 65 (1980) p.472-476, The crystal structure of ternary (Ba,K,Na)-feldspar and its significance