Gallium nitride is also a semiconductor.; it has particular properties that make it very versatile. It has important uses in Blu-ray technology (Gallium nitride-
It remains liquid over a large temperature range, which makes it ideal as a liquid metal thermometer for recording very high temperatures which would vaporise a normal thermometer (Use of metallic gallium alloys as an expansion liquid in thermometers (2004)).
Gallium also melts in your hand: https://youtu.be/0Hx2DYx4umQ.