noun ダウンロード 🔗共有 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. Examples : "The granite countertop sparkled in the sunlight because it contained small crystals of felspar. " 花崗岩のカウンターは、長石の小さな結晶を含んでいたため、日光にきらめきました。 geology mineral material substance chemistry science AIとチャット語彙ゲーム読解練習