Composition: KFe3+4(AsO4)3(OH)4.6-7H2O
Crystal System : Cubic
Colours: Green, greenish, brown, yellow-brown
Lustre : Adamantine, dull
Hardness (H) : 2.5
Specific Gravity (S.G) : 2.8
References: Weber (1977)


Very rare. First oxidation zone (Weber, 1977). Second oxidation zone (30 Level; Bartelke, 1976).


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

Paragenetic and General Notes

Bartelke (1976) notes that small, translucent, admantine, yellow to olive-green crystals of pharmacosiderite were found on 30 Level, citing unpublished Tsumeb Corporation Ltd reports, Geier et al. (1971), and Kahn (1976) as sources.