AM_Na2MgGd2(Si4O12)F2 Formula: Gd2 Si4 Mg Na2 F2 O12 Name: Na2MgGd2(Si4O12)F2 Unit cell: 5.178 7.51 14.381 90.0 90.22 90.0 , V=559.23 Space group: P121/C1 (14)

Maisonneuve V , LeBlanc M , The Canadian Mineralogist , 36 (1998) p.1039-1043, The crystal structure of Na2MgGd2(Si4O12)F2 and its relationship with, leucophanite