Stones are a genus summum of elements found mostly within the two innermost firmaments. They are usually strong and inflexible solids, although some, like basalt, can be molten.
Most stones are solids at any temperature. Basalt, antimony, strontianite, glaze and obsidian, however, may melt into a liquid form called magma or lava under extremely high heat. Arsenic, rather than melting, will become a gas.
Stones tend to be good conductors of sound, although not as much as metals are. They are mean conductors of radiation, and they seldom conduct electricity in their pure forms. It is impossible to generalize heat conductivity; some, like clay, are good isolators of heat, while quartz is a conductor.