Composition: Fe3+AsO4 2H2O
Crystal System : Orthorhombic
Lustre : Adamantine, vitreous
Hardness : 3.5-4.0
Specific Gravity : 3.28
References: Gebhard (1999)


  • Supergene
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Notable Finds

On 30 Level, as thick-bladed, gemmy, blue pseudo-octahedral crystals to 50 mm, with powellite and betpakdalite-CaCa. On 35 Level, again as gemmy blue crystals with the type assemblage for betpakdalite-CaMg. Also found in the third oxidation zone as crystals to 20 mm, with rare associates wilhelmkleinite and gertremmelite.