Composition: CaCu(PO4,AsO4)(OH)
Crystal System : Orthorhombic
Colours: Yellow-green, emerald-green
Lustre : Vitreous
Year of Discovery: 2010
IMA Number: 2010-006
IMA Status: Approved
Named for: Hermann Rose (German mineralogist)

Tsumeb is the Type Locality


Extremely rare. The type specimen is from 28 Level, E.49 Stope, in the second oxidation zone.


  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

Occurs as green, transparent microcrystals, in botryoidal structures to 3 mm, lining a vug in hydroxylapatite which is coloured black with manganese oxides which occasionally include some pseudomalachite. The botryoids comprise alternating sequences of microcrystalline conichalcite, hermannroseite, hydroxylapatite and whitlockite (Von Bezing et al., 2014). The mean size of individual hermannroseite crystals is less than 1 micron!