AM_Roggianite Formula: Ca2 Be O17.34 H7.56 Al2 Si4 Name: Roggianite Unit cell: 18.33 18.33 9.16 90.0 90.0 90.0 , V=3077.66 Space group: I4/MCM (140)

Giuseppetti G , Mazzi F , Tadini C , Galli E , Neues Jahrbuch fur Mineralogie, Monatshefte , 1991 (1991) p.307-314, The revised crystal structure of roggianite: Ca2[Be(OH)2Al2Si4O13]<2.5H2O, Locality: Val Vigezzo, Novara, Italy