Wollastonite is a mineral composed of calcium and silicon with the chemical formula CaSiO3. It is classified as a member of the inosilicate group of minerals, which refers to their chain-like structure. Wollastonite typically occurs in metamorphic and igneous rocks and is often associated with other minerals like diopside, quartz, and calcite.
In terms of physical appearance, wollastonite is typically found in the form of long, bladed crystals or fibrous aggregates. These crystals can vary in color, ranging from white to gray, and occasionally display a pearly or glassy luster. Its hardness on the Mohs scale is between 4.5 and 5.5, making it relatively resistant to scratching.
Industrial applications of wollastonite are quite diverse due to its unique physical and chemical properties. It is widely used as a filler material in various manufacturing processes, including plastics, ceramics, paints, coatings, and construction materials. Its high calcium and low iron content make wollastonite suitable for these applications, as it enhances strength, heat resistance, and dimensional stability.
Furthermore, wollastonite possesses excellent acicularity, which means it can be dispersed into thin, needle-like particles. This property makes it an effective reinforcement material in fiber-reinforced composites, helping to improve the mechanical properties and stability of the final product.
Overall, wollastonite is a versatile mineral that finds extensive use across multiple industries due to its unique physical and chemical properties.
