Chalcophanite

The first mention of chalcophanite at Tsumeb appears to have been by Geier (1962) who listed chalcophanite as a newly-found species at Tsumeb and later confirmed its presence as microscopic inclusions in other manganese oxides (Geier 1973/74).

Pinch and Wilson (1977) followed Bartelke (1976) in noting that chalcophanite is "Found very rarely as microscopic particles in other manganese oxides."

Lombaard et al. (1986) listed chalcophanite as extremely rare. Gebhard (1999) also considered chalcophanite to be extremely rare and noted its occurrence as a component of black manganese oxide coatings on calcite and mottramite.