Composition: Pb2Cu(AsO4)(SO4)(OH)
Crystal System : Monoclinic
Lustre : Vitreous (crystals). Earthy (massive)
Hardness : 4.0-4.5
Specific Gravity : 6.46
Year of Discovery: 1965
IMA Number: 1935(?)
IMA Status: Approved
Discovered By: Karl Biehl
Named for: Composition/relationship
References: Bideaux et al. (1966)


  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone

Notable Finds

As spectacular pseudomorphs after mimetite in the upper levels of the mine (many of which were originally considered to be bayldonite after mimetite). In 1989 fine specimens of azurite on arsentsumebite were recovered during pillar-robbing operations on 6 Level (Von Bezing et al., 2014). Many azurites from the famous "Easter Pocket", recovered from 8 Level in 1994, are associated with arsentsumebite.