Topic summary
Steatite
Extracted from the Wikipedia article Soapstone.
Ceramics
Steatite ceramics are low-cost biaxial porcelains of nominal composition (MgO)3(SiO2)4. Steatite is used primarily for its dielectric and thermally-insulating properties in applications such as tile, substrates, washers, bushings, beads, and pigments. It is also used for high-voltage insulators, which have to stand large mechanical loads, such as insulators of mast radiators.