AM_Eudidymite_1 Formula: Na Be Si3 O8 H Name: Eudidymite Unit cell: 12.63 7.38 14.02 90.0 103.72 90.0 , V=1269.51 Space group: C12/C1 (15)

Fang J H , Robinson P D , Ohya Y , American Mineralogist , 57 (1972) p.1345-1354, Redetermination of the crystal structure of eudidymite and its dimorphic, relationship to epididymite