POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Iron pyrite crystal, coloured scanning electron micrograph (SEM). Iron pyrite (iron disulphide, FeS2), commonly known as fool's gold, is the most abundant sulphide mineral and often occurs as cubes. Magnification: x640 when printed at 10 centimetres wide.
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