Indium is named for the brilliant red line in its spectrum. Indium is a very soft silvery-white metal with a brilliant luster. Indium is most frequently associated with zinc minerals, and it is from these that most commercial indium is obtained; however, it is also found in iron, lead and copper ores. Indium is used in making bearing alloys, germanium transistors, rectifiers, thermistors and photoconductors.