Talc is a hydrated magnesium silicate. Talc deposits form from the transformation of high magnesium rocks by siliceous hydrothermal fluids.  Most talc originates from the alteration of dolomite or ultramafic intrusive rocks. Following this process, talc is always found in combination with other mineral(s). Carbonates and chlorite are the most common associated minerals.

Each talc deposit has a unique morphology and mineralogy, but all talcs exhibit the following unique properties: softness, water repellency, chemical inertness, platyness, and an affinity for organic substances.

These properties make talc a highly prized multi-functional filler and process enabler in an array of applications from plastics to paper, ceramics to paint.