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