RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Rock salt. Multiple cubic crystal 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.
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