AM_Ludlockite Formula: Pb Fe4 As10 O22 Name: Ludlockite Unit cell: 10.426 12.074 18.349 101.84 100.21 90.6 , V=2222.26 Space group: A-1 (2)

Cooper M A , Hawthorne F C , The Canadian Mineralogist , 34 (1996) p.79-89, The crystal structure of ludlockite, PbFe4As10O22, the mineral with, pentameric arsenite groups and orange hair