Talc or Kaolin or Talcum powder or Pulvistalci. 
Talc is hydrated magnesium silicate, it is extracted from our mines, also known as steatite or soapstone. 
Due to its softness, chemical inertness and adsorption properties, it is widely used as anti-sticking, anti-caking lubricant and as thickener in rubber, paint, plastic, paper and cosmetic industries as a filler/extender.