DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Bischofite rock salt, thin section viewed under polarized light. Bischofite 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. Bischofite contains magnesium chloride. This sample was mined in the Netherlands.
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