AM_Labradorite_5
Formula: Ca.34 Na.15 (Si1.17 Al.83) O4
Name: Labradorite
Unit cell: 8.152 12.834 7.079 93.49 116.13 90.4 , V=663.23
Space group: C-1 (2)

Wenk H R , Joswig W , Tagai T , Korekawa M , Smith B K , American Mineralogist , 65 (1980) p.81-95, The average structure of An 62-66 labradorite, Sissone x-ray, feldspar