Composition: Ca(Cu,Zn)(Fe3+,Zn)(AsO4)2(OH,H2O)2
Crystal System : Triclinic
Colours: Colourless, yellow
Lustre : Sub-adamantine, resinous, earthy
Hardness (H) : 5
Specific Gravity (S.G) : 4.18
Year of Discovery: 1999
IMA Number: 1999-030
IMA Status: Approved
Discovered By: Ludger Krahn (German geologist)
Named for: Discoverer
References: Krause et al. (2001)

Tsumeb is the Type Locality


Very rare. The level in the mine from which the type specimen was collected is not recorded.


  • Supergene

Paragenetic and General Notes

Lukrahnite is the calcium analogue of gartrellite, and a member of the tsumcorite group. It occurs as yellow, spherical aggregates to 0.5 mm, with individual crystals to 30 μm.