Talc is a soft, platy hydrated magnesium silicate mineral. Commercial talc grades are evaluated for mineral purity, particle form, colour and unwanted fibrous or hard minerals.
- Formula
- Mg₃Si₄O₁₀(OH)₂
- Class
- Phyllosilicate mineral
- Important character
- Platy particle morphology
Mineral talc and commercial product
Natural talc ore can contain magnesite, dolomite, chlorite or other associated minerals. The name talc alone is not a declaration of purity, brightness or suitability for health-sensitive uses.
Commercial grade is defined by mineral composition, particle size and shape, bulk density, colour and end-use standard.
Functional applications
- Functional filler for stiffness and dimensional behaviour in plastics
- Coatings, paper, ceramics and rubber
- Roofing and agricultural carrier systems
- Personal-care uses only with qualified grade and regulation
Milling and morphology
As talc becomes finer, retaining platy particle character can matter for some uses. Excess mechanical energy can change shape and surface properties as well as PSD.
Hard quartz or carbonate impurities can show different breakage and wear. Air classification can control the coarse tail, but duty and purity require joint verification.
Safe selection framework
- Complete mineralogy and unwanted phases
- Target PSD and particle shape
- Colour, bulk density and surface properties
- Application-specific health, purity and contamination criteria
