AM_Schwartzembergite Formula: Pb1.666 I.334 Cl O2 Name: Schwartzembergite Unit cell: 3.977 3.977 12.566 90.0 90.0 90.0 , V=198.75 Space group: I4/MMM (139)

Welch M D , Hawthorne F C , Cooper M A , Kyser T K , The Canadian Mineralogist , 39 (2001) p.785-795, Trivalent iodine in the crystal structure of schwartzembergite, Pb5IO6H2Cl3