Soft, ductile, malleable, white metal with a bluish tinge. Emits a "tin cry" on bending .
In nature, indium is found in the Earth's crust, 0.1 ppm, in minerals such as zinc blende and sphalerite . The isotopes found in nature are 113In (4.23 %, stable) and 115In (95.77 %, T½ = 6 · 1014 years) .
In pure solid form, indium exist in a face-centered tetragonal structure .