Perlite, also known as pearl stone, is a naturally occurring siliceous rock that is created when molten lava cools quickly. It is often found in a variety of hues, including green, grey, brown, blue, and red, and includes a high concentration of silica. Perlite is a stable amorphous aluminum silicate that possesses a number of qualities, including a high level of heat resistance, a low bulk density, low sound transmission, a large surface area, and a low level of thermal conductivity.