SoapstoneTalc Powder is hydrated silicate of magnesium, Mg3Si4O10(OH)2.. Formed due to alteration of Magnesium rich rocks it posses the distinction of being the softest mineral and has a characteristic soapy feel. It has 1 moh’s scale of hardness. It can easily cut and scratched by nail. It has soapy feel and pearly luster and its platy ness give excellent opacity to the end products Steatite, Talc, Soapstone are the three terms used in trade for one and same mineral.