If you want to know where the data comes from for any particular property, then select that property. You'll see graphs for the properties as well. This page tells you how a sample of indium might be made, or isolated . Indium would not normally be made in the laboratory as it is commercially available.
Indium is a byproduct of the formation of lead and zinc.
Indium metal is isolated by the electrolysis of indium salts in water. Further processes are required to make very pure indium for electronics purposes. All rights reserved.