Composition: Zn2O[As2O3(OH)] (H2O)3.53
Crystal System : Monoclinic
Colours: Very pale-blue, sky-blue
Lustre : Vitreous
Hardness : 1
Specific Gravity : 3.197
IMA Number: 2011-049
IMA Status: Approved
Discovered By: Georg Gebhard (German collector)
Named for: Ian Bruce (British dealer)
References: Cooper et al. (2012)


  • Supergene
  • 3rd Oxidation Zone

Notable Finds

The type specimen is from the third oxidation zone, on Level 44, the so-called "Zinc Pocket".