Wollastonite is the calcium metasilicate mineral CaSiO₃. Its ability to cleave into acicular fragments can carry functional value, so a product is defined by aspect ratio, purity and colour as well as fineness.
- Chemical identity
- Calcium metasilicate, CaSiO₃
- Critical morphology
- May range from massive to acicular
- Product definition
- Aspect ratio and purity alongside PSD
Wollastonite and associated minerals
Wollastonite commonly forms in contact-metamorphic or skarn settings and may occur with calcite, diopside, garnet or quartz. These associates influence brightness, chemistry and abrasion decisions.
Its calcium and silicon content connects it to ceramic raw materials, but it is not feldspar or silica sand.
Why does acicular shape matter?
Acicular particles can provide functional value in plastics, coatings, friction products or ceramic formulations. When high aspect ratio is required, excessive grinding can reduce that value.
Particle-size and morphology targets are therefore specified together, with measurement and acceptance limits tied to the application.
Grinding and classification approach
- Define feed mineralogy and liberation needs
- Validate the balance between fineness and aspect ratio
- Control iron and other contamination sources
- Classify top size and fines for the application
- Include dust collection and surface-treatment boundaries
Selection inputs
- Chemical purity, brightness and associated minerals
- Target PSD and morphology
- Dry or wet preparation route
- Wear and contamination tolerance
- Requirements of the final ceramic, plastic, coating or friction product
