Indium wetting the glass surface of a test tube — Photo: Schtone · Public domain
Indium
A silvery-white post-transition metal (symbol In, atomic number 49) — soft enough to cut with a knife, used in touchscreens and semiconductors.
Intro adapted from Wikipedia (CC BY-SA).
Indium is an IMA-recognized mineral species in the native element class, with the chemical formula In.
It crystallizes in the tetragonal crystal system (space group I4/mmm).
Key properties: specific gravity 7.29; Metallic. Anisotropism: Weak. R1 –R2: n.d luster.
IMA symbol In, IMA status: approved, named in 1964.
Found in greisenized and albitized granite (Orlovskoye deposit, Russia).
It is found associated with Silver (Orlovskoye deposit, Russia).
The name comes from its indigo blue emission spectrum.