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 countertops are made with granite, which contains feldspar, giving them their speckled appearance. "多くのカウンターは、長石を含み、まだら模様の外観を与える御影石で作られています。geologymineralmaterialsubstancescienceChat with AIVocabulary GamePractice Reading
