Tsumeb is the Type Locality
Extremely rare. Second oxidation zone.
- 2nd Oxidation Zone
Paragenetic and General Notes
As radiating groups of colourless needles to 1 mm, in chalcocite (Gebhard, 1999).
In the type specimen otjisumeite needles are intergrown with siderite (older) and schaurteite (younger) (Keller & Bartelke, 1982).
Otjisumeite forms pseudo-hexagonal crystals that can readily be confused with willemite needles.