AM_Akrochordite
Formula: Mn5 As2 O16 H12
Name: Akrochordite
Unit cell: 5.682 17.627 6.832 90.0 99.49 90.0 , V=674.91
Space group: P121/C1 (14)

Moore P B , Sen Gupta P K , Schlemper E O , American Mineralogist , 74 (1989) p.256-262, Akrochordite, (Mn,Mg)5(OH)4(H2O)4(AsO4)2: A sheet structure with amphibole walls