Tsumeb is the Type Locality
Extremely rare. The specimen from which andyrobertsite was eventually described (in 1999) is believed to have been recovered from the first oxidation zone in the 1950s. Andyrobertsite has subsequently been reported from the third oxidation zone.
- 1st Oxidation Zone
- 3rd Oxidation Zone
The type-specimen (W.Pinch collection, probably from the first oxidation zone) has attained iconic status. Subsequently, microcrystalline mixtures of andyrobertsite and stranskiite have been found filling fractures in tennantite-rich massive sulphide ores from the third oxidation zone.
Paragenetic and General Notes
The type assemblage comprises andyrobertsite (with calcioandyrobertsite) on tennantite, with adamite (cuprian), and olivenite. Note that andyrobertsite and calcioandyrobertsite occur as intimate lamellar intergrowths and are not visually distinguishable.