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earth's crust, bismuth is about twice as abundant as gold . in nature, it occurs in its native (free elemental) form, and also as its compounds. it is often associated with the ores of lead, tin, and copper. its most important ores are bismuthinite (a sulfide) and bismite (an oxide). it is usually not
economical to mine bismuth as a primary product. rather, it is most often obtained as a byproduct of the processing of other metal ores, especially lead, or other metal alloys. like lead (but to a much lesser extent), it is radiogenic, being formed from the natural radioactive decay of uranium and thorium...
https://www.newworldencyclopedia.org/entry/Bismuth