AM_Asisite_1 Formula: Pb3.5 Si.5 O4 Cl Name: Asisite Unit cell: 3.8932 3.8932 22.803 90.0 90.0 90.0 , V=345.63 Space group: I4/MMM (139)

Welch M D , Mineralogical Magazine , 68 (2004) p.247-254, Pb-Si ordering in sheet-oxychloride minerals: the super-structure of asisite,, nominally Pb7SiO8Cl2, Locality: Kombat mine, Namibia