noun 다운로드 🔗공유 석영 The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO2. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment. Examples : "The geologist found a beautiful piece of quartz in the park. " 지질학자는 공원에서 아름다운 석영 조각을 발견했다. geology mineral material chemistry science environment nature AI와 채팅어휘 게임독해 연습
