1. Brucite is formed when dolomitic-marble, or Mg-bearing limestone, is subject to contact metamorphism, periclase (MgO) is formed and hydrates to Brucite in the presence of water

2. It is a common alteration product of periclase in marble; a low-temperature hydrothermal vein mineral in metamorphosed limestones and chlorite schists; and formed during serpentinization of dunites.