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硅灰石,即偏硅酸钙,由二氧化硅和氧化钙组成的矽卡岩类矿物。其特点是:晶体常沿结晶(?)轴方向延长成板状,故又称“板石”;集合体多为放射状、纤维状、使坯料易于压制成型;纯者为乳白色、白色,具玻璃光泽,不含结晶水和碳酸根,烧时不产生气体。硅灰石作为矿物早已熟知,但作为工业矿物被开采利用,仅始于30年代。1933年美国加利福尼亚州克德西(?),曾小规模开采硅灰石,作矿渣绒石棉的充填料。直到60年代,硅灰石才较大规模地被开发利用。
Wollastonite, ie calcium metasilicate, is a skarn mineral composed of silica and calcium oxide. Its characteristics are: the crystal is often along the crystallographic (?) Axis extending into a plate, it is also known as “plate ”; aggregate mostly radial, fibrous, easy to suppress the formation of blank; pure white, A shiny glass, non-crystalline water and carbonate, burning does not produce gas. Wollastonite is well known as a mineral, but was exploited as an industrial mineral only from the 1930s. 1933 Kedi (?), California, USA, had a small-scale mining of wollastonite, filling mineral wool asbestos. Until the 1960s, wollastonite was developed and utilized on a larger scale.