AM_Symesite Formula: S Pb10 Cl4 O12 Name: Symesite Unit cell: 19.727 8.796 13.631 82.21 78.08 100.04 , V=2242.38 Space group: B-1 (2)

Welch M D , Cooper M A , Hawthorne F C , Criddle A J , American Mineralogist , 85 (2000) p.1526-1533, Symesite, Pb10(SO4)O7Cl4(H2O), a new PbO-related sheet mineral: Description and, crystal structure