noun 다운로드 🔗공유 장석 Any of a large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks. Examples : "The granite countertop sparkled in the sunlight because it contained small crystals of felspar. " 화강암 조리대는 작은 장석 결정이 들어 있어서 햇빛에 반짝였다. geology mineral material substance chemistry science AI와 채팅어휘 게임독해 연습
