# Strontium

The two major natural sources of strontium are the minerals celestine (${\displaystyle {\ce {SrSO_4}}}$, strontium sulfate) and strontianite (${\displaystyle {\ce {SrCO_3}}}$, strontium carbonate). Both the metal and strontianite are named for Strontian, a Scottish village near where it was first discovered in 1790 by Adair Crawford and William Cruickshank. The pure metal was first isolated by Humphry Davy in 1808 via electrolysis.
Strontium is a mixture of four stable isotopes: ${\displaystyle {\ce {^{84}Sr}}}$, ${\displaystyle {\ce {^{86}Sr}}}$, ${\displaystyle {\ce {^{87}Sr}}}$, and ${\displaystyle {\ce {^{88}Sr}}}$, with the latter comprising 82.6% of all natural strontium. Unstable (radioactive) isotopes include ${\displaystyle {\ce {^{89}Sr}}}$ and ${\displaystyle {\ce {^{90}Sr}}}$, both used in radiation therapy to treat bone cancer. Because of strontium's similar uptake in the body as calcium, higher doses of radioactive strontium (particularly as fallout from nuclear explosions) can cause bone cancer and leukemia.