Multiple cubic cystal of halite or rock salt, a naturally occurring sodium chloride (NaCl). Rock salt is most common in nature as a sedimentary precipitate, resulting from the evaporation of saline waters, usually saline lakes Rock salt crystals fit in the cubic crystal system and have an isometric hexoctahedral crystal symmetry. Large, well-developed crystals are rare as they are unstable unless stored in zero moisture conditions. The crystal group in this sample, from Boekeloo in the Netherlands, measures about 70 millimetres across.
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