AM_Matlockite_1 Formula: Pb F Cl Name: Matlockite Unit cell: 4.09 4.09 7.21 90.0 90.0 90.0 , V=120.61 Space group: P4/NMM (129)

Bannister F A , Hey M H , Mineralogical Magazine , 23 (1934) p.587-597, The crystal-structure and optical properties of matlockite (PbFCl), Locality: Matlock, Derbyshire, England