STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Sea salt. Coloured scanning electron micrograph (SEM) of sea salt, showing its crystalline structure. Sea salt consists mainly of sodium chloride (NaCl), but unlike pure table salt, it also contains traces of other elements. Magnification: x4000 when printed at 10 centimetres across.
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