Composition: CaFe3+2(AsO4)2(OH)2
Crystal System : Orthorhombic
Lustre : Vitreous
Hardness : 3.5
Specific Gravity : 4.16
Year of Discovery: 1982
IMA Number: 2001-054
IMA Status: Approved
Discovered By: Terry Seward (New Zealand-based chemist and mineralogist)
Named for: Discoverer
References: Roberts et al. (2002)


  • Supergene
  • 2nd Oxidation Zone

Notable Finds

The type specimen was collected from 31 Level by Professor Terry Seward in 1982.