The akrochordite group comprises just three minerals: akrochordite: Mn2+5(AsO4)2(OH)4.4H2O guanacoite: MgCu2Mg2(AsO4)2(OH)4(H2O)4 vargite: MnCu2Mn2(AsO4)2(OH)4(H2O)4 They are all arsenates. Back to Minerals