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.
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- 石英由硅石組成的一種非常堅硬的礦物質(zhì)，SiO2，廣布世界各地，存在于許多不同種類(lèi)的巖石中，包括沙巖和花崗巖。石英種類(lèi)包括瑪瑙、玉髓、黑矽石、燧石、蛋白石及水晶
