noun🔗Share長石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."Many granite countertops are made up of quartz, mica, and feldspars. "多くの御影石のカウンターは、石英、雲母、そして長石でできています。geologymineralmaterialscienceChat with AIVocabulary GamePractice Reading
