noun🔗Share장석Any 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."Many granite countertops are made up of quartz, mica, and feldspars. "많은 화강암 조리대는 석영, 운모, 그리고 장석으로 구성되어 있습니다.geologymineralmaterialscienceChat with AIVocabulary GamePractice Reading
