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for lead in various applications, including solder, paints, bullets and shot, brasses for plumbing, and fishing sinkers. occurrence in the 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...
https://www.newworldencyclopedia.org/entry/Bismuth