The chemical formula is MgCl₂. The substance can form hexahydrate, namely magnesium chloride hexahydrate (MgCl₂ · 6H₂O), which contains six crystal water. In industry, anhydrous magnesium chloride is often called halogen powder, while for magnesium chloride hexahydrate, it is often called brine flake, brine granule, or brine block.

Both anhydrous magnesium chloride and magnesium chloride hexahydrate share a common property: they are highly deliquescent and soluble in water. Therefore, they should be stored in a dry, cool place.

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