Composition: Fe3+O(OH)
Crystal System : Orthorhombic
Colours: Reddish-brown, ruby-red
Lustre : Sub-metallic
Hardness (H) : 5
Specific Gravity (S.G) : 3.85-4.09


Common. In all three oxidation zones, but easily overlooked.


  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Paragenetic and General Notes

As yellowish-red needles mixed with goethite in "limonitic" masses (Pinch and Wilson, 1977). As brilliant small crystals together with beudantite and siderite (Gebhard, 1999).