Answer: Iron Sulfide
Notes: The mineral pyrite or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2 (iron (II) disulfide). “Fool's Gold” is technically known as pyrite or iron sulfide (FeS2) and is one of the most common sulfide minerals. Its nickname is "Fool's Gold," but it often contains a surprising amount of gold.
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