noun 下载 🔗分享 长石, feldspat。 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. " 这块花岗岩台面在阳光下闪闪发光，因为它含有细小的长石晶体。 geology mineral material substance chemistry science 与AI对话词汇游戏阅读练习
