DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
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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