Galloplumbogummite


Composition: Pb(Ga,Ge,Al)3(PO4)2(OH)6
Crystal System : Trigonal
Colours: Colourless, frosted-white
Specific Gravity (S.G) : 4.62
Year of Discovery: 2009
IMA Number: 2010-088
IMA Status: Approved
Named for: Composition/relationship

Tsumeb is the Type Locality

Distribution

Extremely rare. The type specimen is from the second oxidation zone.

Occurrence

  • Supergene
  • 2nd Oxidation Zone

Notable Finds

Galloplumbogummite was discovered on a specimen from the second oxidation zone that had been donated to the mineralogical museum of Hamburg by Professor Hermann Rose (1883-1976).

Paragenetic and General Notes

Initially described as gallium-rich plumbogummite (Mills et al., 2009). Visually, indistingushable from the un-named gallium analogue of arsenocrandallite. Interestingly a Ge-rich plumbogummite has recently been identified in vugs containing fleischerite and bartelkeite (Joy Desor, private communication to M.Southwood, 2014).