Talc Powder IntroductionTalc is a mineral, produced by the mining of talc rocks and then processed by crushing, drying and milling. ... not separate minute fibers which are very similar to asbestos. Talc powder has properties of lubricity, viscous resistance, flowing boosting, fire ... expansion to resist crazing. In stonewares, small percentages of talc are used to flux the body and therefore improve ...