Magnesium chloride is a building block for making other magnesium compounds. MgCl2 comes in several different hydrates and can be found in nature in several environments such as ancient seabeds and salt lakes.
Up Stream Materials/Building Blocks:
Bischofite (mined mineral).
Down Stream Materials Consuming Magnesium Chloride:
Road Maintanence (dust control and stabilization)
Animal Feed (supplement)