Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8) are a group of rock-forming silicate minerals that make up as much as 60% of the Earth's crust.
长石（英语：feldspar）是长石族矿物的总称，是地壳中最重要的造岩成分，比例达到60%.
长石的主要化学成分包括钾、钠、钙、钡等元素的铝硅酸盐矿物（KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8）。
