AM_Labradorite
Formula: Ca.325 Na.16 (Si1.19 Al.81) O4
Name: Labradorite
Unit cell: 8.1736 12.8736 7.1022 93.462 116.054 90.475 , V=669.65
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, Surtsey x-ray, feldspar