Seafoam is a fibrous, watery magnesium silicate that is usually white, light gray, or light yellow in color, and is opaque and non-glossy. Some of them are shaped like clods of earth, while others are in the form of a strange crust or nodule. Under an electron microscope they can be seen to be made up of countless filaments clustered together in rows of flakes. Seafoam has a strange characteristic, when they meet water will absorb a lot of water and thus become soft, and once dry will become hard again. The English name of seafoam is Sepiolite. sepia is a squid, a marine animal, because of its porous skeleton. Light body can float on the water, so this mineral is named seafoam according to its form is divided into α-seafoam and β-seafoam two kinds. The former into a large bundle of fibrous crystal output, which is usually called fibrous seafoam.