The chemical element (symbol Mg) with an atomic number of 12. It is a light, easily flammable, silvery-white alkaline earth metal.

plural of magnesium sulfate

(inorganic chemistry) A white, crystalline powder (when pure), usually found in an impure, brown, non-crystalline form.

Alternative spelling of magnesium sulfide

(inorganic chemistry) The salt MgSiO₃ that occurs naturally as talc, asbestine, gymnite, meerschaum and, combined with other salts, as many other minerals

(inorganic chemistry) The magnesium salt of hydrochloric acid, MgCl₂; it has many industrial applications including the electrolytic production of magnesium metal.

(inorganic chemistry) The magnesium salt of carbonic acid, MgCO₃; it is a white powdery solid that occurs as magnesite and other minerals; it used as a mild base and in numerous industrial applications

(inorganic chemistry) The base Mg(OH)₂ that occurs naturally as brucite; it is used as an antacid and in many industrial processes

The magnesium salt of sulfuric acid (chemical formula MgSO₄), commonly called Epsom salts.

Any solid solution of magnesium with aluminium, zinc, manganese, silicon, zirconium etc that has a low specific gravity and is used in aircraft manufacture, etc.