Wollastonite Introduction

　　Wollastonite has the chemical formula Ca3[Si3O9]. It crystallizes in the triclinic system and belongs to the single-chain silicate mineral group. It typically occurs in flaky, radial, or fibrous aggregates. Its color is white with a slight grayish tinge. It exhibits a vitreous luster and pearly luster on cleavage surfaces. Its hardness ranges from 4.5 to 5.0. Cleavage is perfect parallel to {100} and moderate parallel to {001}; the angle between these two cleavage planes is 74°. Its density is 2.78 to 2.91 grams per cubic centimeter. Wollastonite is primarily found in contact metamorphic zones where acidic intrusive rocks come into contact with limestone, serving as a major mineral constituent of skarns. Additionally, it can also be found in certain deeply metamorphosed rocks. Wollastonite is used as a raw material or filler in industries such as papermaking, ceramics, cement, rubber, and plastics; as a gas filtration material and thermal insulation material; and as a fluxing agent in metallurgy.

　　Wollastonite is a triclinic mineral characterized by fine, platy crystals that often aggregate in radiating or fibrous forms. Its color ranges from white to occasionally light gray or pale reddish hues. It exhibits a vitreous luster, and cleavage surfaces display a pearly luster. Its hardness ranges from 4.5 to 5.5, with a density of 2.75 to 3.10 g/cm³. It is completely soluble in concentrated hydrochloric acid. Under normal conditions, it demonstrates excellent resistance to acids, alkalis, and chemical corrosion. Its hygroscopicity is less than 4%. It has low oil absorption, low electrical conductivity, and good insulating properties. Wollastonite is a typical metamorphic mineral, primarily found in the contact zones between acidic rocks and limestone, where it occurs in association with vesuvianite and garnet. It can also be found in deeply metamorphosed calcareous crystalline schists, volcanic ejecta, and certain alkaline rocks. Wollastonite is an inorganic needle-like mineral distinguished by its non-toxicity, resistance to chemical corrosion, excellent thermal stability and dimensional stability, as well as its glassy and pearly luster. It features low water absorption and oil absorption, superior mechanical and electrical properties, and a certain reinforcing effect. Wollastonite products are characterized by long, easily separable fibers with low iron content and high whiteness. These products are mainly used as reinforcing fillers in polymer-based composites, such as plastics, rubber, ceramics, coatings, and construction materials.

　　Wollastonite is a chain-like metasilicate that also exhibits fibrous and needle-like forms. Due to its unique crystal morphology,

　　The crystalline structure of wollastonite determines its properties. Wollastonite boasts excellent insulation properties, as well as high whiteness, favorable dielectric performance, and superior resistance to heat and weathering. Consequently, wollastonite is widely used in fields such as ceramics, chemical industry, metallurgy, papermaking, plastics, and coatings.

　　The chemical molecular formula of wollastonite is CaSiO3, and its structural formula is Ca3[Si3O9]. Its theoretical chemical composition is: 48.25% CaO and 51.75% SiO2. Pure wollastonite is rare in nature; during its formation, Ca is sometimes partially replaced by ions such as Fe, Mn, Ti, and Sr, resulting in solid-solution minerals. It also contains small amounts of Al and trace amounts of K and Na.

　　The above is an introduction to wollastonite. For any business inquiries, please call Shenyang Jingang Wollastonite Mining Co., Ltd.