ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Salt. Dark field light micrograph of sodium chloride crystals, the common salt. This is a white crystalline compound widespread in nature as a solid (rock salt), around margins of salt lakes and in solution (about 3%) in seawater. Other metals are present in the raw material such as calcium, iron and magnesium. These are often removed by precipitation before the salt is sold. Salt is used as a food seasoning and preservative, and as a raw material in industrial processes such as in glass and soap making. Magnification: x60.
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