The most important ores of bismuth are bismuthinite and bismite.
2.
They are both of the bismuthinite-aikinite series.
3.
Bismuthinite forms a series with the lead, copper, bismuth mineral aikinite ( S 3 ).
4.
At the Tanza location it occurs as a secondary mineral formed by the oxidation of native bismuth or bismuthinite.
5.
Bismuth most commonly occurs as the mineral bismuthinite, but bismuth also occurs in elemental form or in sulfide ores.
6.
At the type locality it occurs associated with magnetite, sphalerite, pyrrhotite, pyrite, arsenopyrite, chalcopyrite, digenite, bornite, molybdenite, galena, native bismuth and bismuthinite.
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