A hard glossy mineral consisting of silicon dioxide in crystal form,present in most rocks (especially sandstone and granite),yellow sand is quartz with iron oxide impurities.

• 一种坚硬而光滑的矿物，由二氧化硅组成，呈晶体状，见于多数岩石中（尤其是砂岩和花岗岩），黄沙即为含有氧化铁杂质的石英。