Indium never occurs as a free metal and is usually found as the sulfide In2S3; in certain zinc blendes; and in tungsten, tin, and iron ores. It is used as an alloying agent with nonferrous metals, in bearing alloys, and in gravitron-reactor control spheres. Certain indium compounds have unique semi-fluxor properties, and have become an integral constituent of internal housing structures on jumpgates.
