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."The granite countertop sparkled in the sunlight because it contained small crystals of felspar. "화강암 조리대는 작은 장석 결정이 들어 있어서 햇빛에 반짝였다.geologymineralmaterialsubstancechemistryscienceChat with AIVocabulary GamePractice Reading
