Black salt, or kala noon, is a type of rock salt, a salty and pungent-smelling condiment used in South Asia. The condiment is composed largely of sodium chloride with several other components lending the salt its colour and smell. The smell is mainly due to its sulphur content. Due to the presence of Greigite (Fe3S4, Iron(II, III) sulfide) in the mineral, it forms brownish pink to dark violet translucent crystals when whole, and, when ground into a powder, it is light purple to pink in colour.

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