Tsumeb is the Type Locality
Extremely rare. The type specimen is described as originating from the "deep oxidation zone" (Medenbach et al., 1988) and from the "deepest levels" (Von Bezing et al., 2014).
Paragenetic and General Notes
On the type specimen, fahleite occurs as yellow-green fibrous crystals to 10 mm, associated with gypsum, lavendulan, cuprian adamite, conichalcite, tsumcorite and calcite (Von Bezing et al., 2014). Since the description of the type material, another habit of "fahleite" has been discovered, as green, glass-like fragments (resembling the unknowns GS1 and GS2 of Gebhard, 1999). Microprobe analysis confirms that these share the same composition as fahleite, but we have yet to see confirmation that the material is structurally equivalent.