Gallium
Gallium is a metal, but it has some unusual properties. Its melting point is 85.58 Fahrenheit. If it is held in a person's hand, it will melt. It makes a stain on your hand when put on your hand. Gallium is safe in your hands but is not edible. Some Gallium Compounds can be very dangerous. Gallium is a semiconductor, meaning that it conducts electricity reasonably well but not as well as a metal. That means gallium can be used in computers to make them work. It is very shiny, so it is used to create mirrors when its in its liquid form. In its purest extracted form, gallium is a vibrant silver color. As a solid, it is blue-gray. Gallium has been used in nuclear bombs to stabilize the crystal structure.  It's related to aluminium, indium, and thallium.