AM_Orlandiite Formula: Pb1.5 Se.5 Cl2 O2 H Name: Orlandiite Unit cell: 8.136 8.43 9.233 62.58 71.84 75.13 , V=529.29 Space group: P-1 (2)

Demartin F , Gramaccioli C M , Pilati T , The Canadian Mineralogist , 41 (2003) p.1147-1153, The crystal structure of orlandiite, Pb3Cl4(SeO3).H2O, a complex case, of twinning and disorder