Magnesium Sulfate

Large crystals of magnesium sulfate are rare, while crusts and massive forms are much more common. Epsomite (the mineral form of magnesium sulfate) forms as a precipitation from vapors (efflorescent) on limestone cave walls and on the walls and timbers of deep-shaft mines. In addition to the solubility of the crystals, the bitter, salty taste of epsomite is very characteristic of the compound. The dust of the salt is irritating to the eyes and throat as may be experienced by exposure to dry lake beds.