Composition: Cu(UO2)2(AsO4)2.8H2O
Crystal System : Tetragonal
Colours: Pale-green, grass-green, emerald-green
Lustre : Vitreous, pearly
Hardness (H) : 2.0-2.5
Specific Gravity (S.G) : 3.64
References: Gebhard (1999)


Extremely rare. Second oxidation zone, Level 30.


  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

Gebhard (1999) records that the co-type specimen for keyite, from 30 Level, also hosts an aggregate of flattened, apple-green metazeunerite crystals to 1 mm.

A separate specimen, formerly owned by Crystal Classics and also from 30 Level, showed a small group of platy metazeunerite crystals (to 2 mm) associated with hidalgoite and betpakdalite (all analytically verified) in a vug in siliceous matrix.