Soapstone Wikipedia
Samples of soapstone. Soapstone (also known as steatite or soaprock) is a talcschist, which is a type of metamorphic is composed largely of the magnesium rich mineral is produced by dynamothermal metamorphism and metasomatism, which occur in the zones where tectonic plates are subducted, changing rocks by heat and pressure, with influx of fluids, but without melting.