1. A rock formed from the metamorphism of quartz sandstone. 
   石英岩一种由石英沙岩的变质作用而形成的岩石
2. 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。
3. A very hard mineral composed of silica, SiO2, found worldwide in many different types of rocks, including sandstone and granite. Varieties of quartz include agate, chalcedony, chert, flint, opal, and rock crystal. 
   石英由硅石组成的一种非常坚硬的矿物质，sio2，广布世界各地，存在于许多不同种类的岩石中，包括沙岩和花岗岩。石英种类包括玛瑙、玉髓、黑矽石、燧石、蛋白石及水晶
4. minerals of quartz group 
   石英族矿物
5. It is quartz clock. 
   这是一个石英钟。

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• 1. 石英砂岩
  含中砾砂岩,卵石砂岩 quartz sandstone...石英砂岩 quartzitic sandstone...正石英砂岩 quartzose sandstone
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• 2. 石英质砂岩
  quartz sand 石英砂...quartz sandstone 石英质砂岩...quartz schist 石英片岩
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