Carnallite rock salt

Carnallite rock salt

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Carnallite rock salt, thin section viewed under polarized light. Carnallite is a type of rock salt. It is formed by precipitation during drying of sea water. As such it forms a sediment known as an evaporite. Evaporites are found as part of marine sedimentary rock sequences. Carnallite contains potassium and magnesium chlorides. It is used as a source of potassium salts. This sample was mined in the Netherlands.

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Keywords: carnallite, chloride, chlorides, crystal, crystalline, crystals, earth science, evaporite, geology, magnesium, mineral, polarized light, potassium, precipitate, rock salt, rocks, sectioned, sediment, sedimentary, sedimentary rock, slice, sliced, thin section

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