AM_Burgessite
Formula: Co As O6.5 H7
Name: Burgessite
Unit cell: 4.7058 9.299 12.738 90.0 98.933 90.0 , V=550.64
Space group: P121/N1 (14)

Cooper M A , Hawthorne F C , The Canadian Mineralogist , 47 (2009) p.165-172, The crystal structure of burgessite, Co2(H2O)4[AsO3(OH)]2(H2O),, and its relation to erythrite, Locality: Keeley mine, South Lorrain Township, Timiskaming District, Ontario, Canada