AM_Sverigeite Formula: Sn (Mn1.37 Mg.63) Na Si3 Be2 O13 H Name: Sverigeite Unit cell: 10.815 13.273 6.818 90.0 90.0 90.0 , V=978.71 Space group: IMMA (74)

Rouse R C , Peacor D R , Metz G W , American Mineralogist , 74 (1989) p.1343-1350, Sverigeite, a structure containing planar NaO4 groups and chains of 3- and, 4-membered beryllosilicate rings