TALC
Talc, common silicate mineral that is distinguished from almost all other minerals by its extreme softness (it has the lowest rating [1] on the Mohs scale of hardness). Its soapy or greasy feel accounts for the name soapstone given to compact aggregats of talc and other rock-forming minerals. Dense aggregates of high-purity talc are called steatite. Since ancient times, soapstones have been employed
Read More