It is a chemical compound made up of bromine and magnesium. The molecular formula of Magnesium bromide is MgBr2.
In its anhydrous form, it's hygroscopic hexagonal crystal white in color. In its hexahydrate for, it's colorless monoclinic crystal. It can be often ready by the following method.
On completion, it is evaporated and the solid leftover is collected. It's soluble in water as well as alcohol. It is naturally found in some minerals like carnallite and bischofite.