KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY
Fool's gold. Lump of fool's gold, also known as pyrite, iron pyrites or iron sulphide. Fool's gold is used as a source of sulphur and in the manufacture of sulphuric acid. It is the most abundant sulphide mineral, being found as an accessory in igneous, contact metamorphic, and sedimentary rocks. Its brass-yellow colour and metallic lustre lead inexperienced prospectors to believe that they have found precious metal.
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