Tsumeb is the Type Locality
Extremely rare. Second oxidation zone, 31 Level.
- 2nd Oxidation Zone
The type specimen was collected from 31 Level by Professor Terry Seward in 1982.
Paragenetic and General Notes
Sewardite is the calcium-dominant analogue of carminite.
In the type specimen sewardite occurs as dark-red, platy to compact, anhedral to subhedral masses to 0.3 mm. It is intimately inter-grown with a dark botryoidal mass of a close mixture of ferrilotharmeyerite and "another tsumcorite group mineral" that may be a cuprian / zincian variety of ferrilotharmeyerite, or a zinc-dominant analogue of lukrahnite (Roberts et al., 2001).
Sewardite has recently been verified as occurring with scorodite on a specimen belonging to American collector, Shields Flynn (http//rruff.info/R141206; accessed November 2015).