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Halitemore commonly known as Rock Salt is a mineral formed from sodium chloride. It's chemical formula is NaCl and this also includes other variations of salt such as common salt and table salt. Rock salt tends to be the industrial name used for Halite.

It forms as isometric crystals and is typically colourless or white, but may also be other colours depending on the amount and type of impurities contained within it. The salt occurs in beds of sedimentary evaporite minerals. This is caused by large lakes and seas drying up. These salt beds can be hundreds of metres deep.

The primary difference between rock salt and ordinary table salt is the size and colour. Rock salt forms in very large, chunky crystals, as opposed to the small crystals seen in table salt. Like table salt, rock salt also has an assortment of trace minerals which can have an impact on how it behaves chemically. The large crystal size of rock salt means it is not usually used in cooking as it takes too long to dissolve.

There are other differences between the two most common types of salt. Deposits of rock salt are usually the remains of inland seas which evaporated thousands or millions of years ago. In contrast, table salt comes almost exclusively from evaporation ponds which remove salt from seawater.

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