AM_Weeksite_1 Formula: U8 Si20 K4.96 Ca.48 Ba O72.12 H4.74 Name: Weeksite Unit cell: 14.209 14.248 35.869 90.0 90.0 90.0 , V=7261.67 Space group: CMMB (67)

Jackson J M , Burns P C , The Canadian Mineralogist , 39 (2001) p.187-195, A re-evaluation of the structure of weeksite, a uranyl silicate, framework mineral