Bismuth oxide is naturally found as the mineral
bismite, however, it is also obtained as a by-product from the smelting of lead ores and copper ores.
Bismuthcontaining minerals found include native bismuth,
bismite, bismutite, bismuthinite, and beyerite (Jahns and Wright, 1951).
Much use was made of the acronym BIKONRISNOT: "But I know of no reason it should not occur there"; when a locality known to have bismuth also has
bismite ascribed to it, bikonrisnot is about all one can say.