Sodium is an abundant element. It is found in the sun and many other stars. It is the 6th most abundant element on Earth, comprising about 2.6% of the earth's crust. It is the most abundant alkali metal.
Although it too reactive to occur in pure elemental form, it is found in many minerals, including halite, cryolite, soda niter, zeolite, amphibole, and sodalite. The most common sodium mineral is halite or sodium chloride salt.
