Rock salt refers to deposits of solid salt found in various parts of the world. Unlike pure sodium chloride, rock salt often appears brown due to impurities. These impurities give it a different coloration compared to the white, crystalline appearance of pure sodium chloride.
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Rock salt is a naturally occurring mineral primarily composed of sodium chloride (NaCl) with impurities giving it a characteristic color and appearance. While pure sodium chloride is colorless, rock salt often appears translucent and varies in color due to the presence of impurities like minerals and sediments. The impurities can impart shades of pink, brown, or gray to the rock salt. Commercially available rock salt, commonly used for de-icing roads, may also contain additives to enhance its performance. The impurities in rock salt do not affect its basic chemical composition but contribute to its distinctive appearance.