The inset shows minerals association within a grain of an approximate size of 60 microns (red: galena, blue: kaolinite, green: siegenite
(cobalt-nickle sulfide), yellow: chalcopyrite, and navy: sphalerite).
Cobalt, copper and uranium are the important ore metals in a large number of deposits within and near the "Katanga Crescent." Many beautiful cobalt-containing minerals have come from this famous area, including carrollite, cattierite, siegenite, comblainite, heterogenite, kolwezite, oursinite, sphaerocobaltite, and brilliant pink cobaltoan calcite and dolomite.
The Shinkolobwe mine has yielded cattierite, carrollite, linnaeite, penroseite, siegenite, comblainite, oursinite and heterogenite (3R).
The cobalt content of Shinkolobwe siegenite is 26%.
In the lower part of the Shinkolobwe oxidation zone, siegenite rich in selenium is also found, in close association with penroseite (described below).
Peproseite was discovered in the oxidation zone of the Shinkolobwe deposit (Deliens, 1975), in association with seleniferous siegenite and molybdenite.
Many of them occur only in microscopic sizes (siegenite
, rammelsbergite, linnaeite, lautite, tennantite) and most are uncolorful (galena, sphalerite, molybdenite, millerite, chalcocite), unlike the secondary minerals such as malachite, azurite and cyanotrichite.