It is available in ultrapure form. Indium is a very soft, silvery-white metal with a brilliant luster. It wets glass, as does gallium. It is used in making bearing alloys, germanium transistors, rectifiers, thermistors, and photoconductors. It can be plated onto metal and evaporated onto glass, forming a mirror as good as that made with silver but with more resistance to atmospheric corrosion.
Natural indium contains two isotopes.
One is stable.