ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Iron pyrite crystal. Pyrite or iron disulphide (FeS2) is the most abundant sulphide mineral, more commonly known as fool's gold. It is mined worldwide as a source of sulphur, which is used to produce sulphuric acid. The word pyrite comes from the Greek, which translates as "stone which strikes fire". Iron pyrite often occurs as well- formed cubic, octahedral or pyritohedral crystals. Magnification: 50x.
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