Iron sulfide

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Iron sulfide is the chemical compound FeS, a black solid. It is made of iron and sulfide ions. FeS has iron in its +2 oxidation state. It reacts with acids such as hydrochloric acid to make hydrogen sulfide gas.

In plural, "iron sulfides" may refer to a range of chemical compounds composed of iron and sulfur. For example to FeS2 (iron disulfide) found in the ground as the mineral pyrite. FeS2 is shiny like a metal and has a bright golden color. That's why it is sometimes called "fool's gold".

Natural minerals[change | change source]

By increasing order of stability: