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Himalayan salt is rock salt (halite) mined from the Salt Range mountains in the Pakistani region of Punjab. The salt is principally sodium chloride but has trace presence of calcium, iron, zinc, chromium, magnesium, and sulfate, minerals which give some veins of the salt a pink or reddish color. Himalayan salt is often used as a substitute for common table salt, sometimes being promoted as a healthier alternative, although there is no scientific evidence to support this. It has also been used as a material for serving dishes, baking stones, and griddles. This image of coarse white and pink grains of Himalayan salt, up to 5 millimetres (0.20 in) in diameter, was focus-stacked from 23 individual photographs.Photograph credit: Ivar Leidus