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硅质石灰质是脉石英、石英岩、石英砂岩的总称。主要用于冶金工业用的酸性耐火砖。纯硅石可作石英玻璃或提炼单晶硅。结晶硅石外观一般呈乳白色、灰白色、淡黄色以及红褐色。有鲜明的光泽，断面平滑连续，并带有锐利棱角，硬度、强度都很大。脉石英呈致密块状，纯白色，半透明，发油脂光泽，断面呈贝壳状，石英结晶颗粒多在2mm以上，肉眼可辨。化学工业上用于制备硅化合物和硅酸盐，也可作硫酸塔的填充物。建材工业上用于玻璃、陶瓷、硅酸盐水泥等。可用作工业硅等铁合金冶炼的原材料。
Silicate limestone is the general name of vein quartz, quartzite and quartz sandstone. It is mainly used in acid refractory bricks for metallurgical industry. Pure silica can be used as quartz glass or single crystal silicon. The appearance of crystalline silica is usually Milky white, gray white, light yellow and reddish brown. It has bright luster, smooth and continuous section, sharp edges and corners, and has high hardness and strength. Vein quartz is dense and massive, pure white, translucent, greasy and lustrous, with a shell-like cross-section. Quartz crystalline particles are more than 2 mm, which can be distinguished by naked eyes. In chemical industry, it is used to prepare silicates and silicates, and also to fill sulfuric acid column. Building materials are used in glass, ceramics, Portland cement and so on. It can be used as raw material for ferroalloy smelting such as industrial silicon.