柯林斯詞典feldspar /?f?ld?spɑ?, ?f?l?spɑ?/ (also felspar) 1. N any of a group of hard rock-forming minerals consisting of aluminium silicates of potassium, sodium, calcium, or barium: the principal constituents of igneous rocks. The group includes orthoclase, microcline, and the plagioclase minerals 長石 返回 feldspar劍橋詞典a common type of mineral found especially in igneous rocks such as granite 長石（一種常見鑛石，尤見於火成巖，例如花崗巖中） 返回 feldspar