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Polarised light micrograph of a salt crystal

Polarised light micrograph of a salt crystal

H110/0709

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51.1 MB (2.7 MB compressed)

5197 x 3435 pixels

43.9 x 29.0 cm ⏐ 17.3 x 11.4 in (300dpi)

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Credit

ERIC GRAVE / SCIENCE PHOTO LIBRARY ERIC GRAVE / SCIENCE PHOTO LIBRARY

Caption

Salt. Polarised light micrograph of a crystal of sodium chloride, the common salt. It 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. It is obtained commercially by the evaporation of brine from seawater or from the solid deposits in rock salt mines. Other metals are present in the raw material such as calcium, iron and magnesium and they may be removed by precipitation with sodium carbonate or sodium hydroxide. Salt is used as a food seasoning and preservative, and as a raw material in industrial processes such as in glass and soap making.

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