Composition: K2Ca2Cu2+(SO4)4.2H2O
Crystal System : Triclinic
Colours: White, pale-blue, pale-green
Lustre : Vitreous
Hardness (H) : 3
Specific Gravity (S.G) : 2.95


Very rare. Second oxidation zone (35 Level).


  • Supergene
  • 2nd Oxidation Zone

Notable Finds

White leightonite crystals are associated with chalcanthite, lammerite, anhydrite and ferroan thometzekite on 35 Level (Gebhard, 1999). Keller and Bartelke (1982) reported almost the same assemblage (minus the thometzekite) specifically from the "North-East Stope" on 35 Level.

Paragenetic and General Notes

Leightonite occurs with anhydrite and the two minerals are readily confused; however, anhydrite can be distinguished from leightonite by the former's perfect cleavage.