研究长石对于准确地确定岩石的名称,探讨岩石和矿床的形成及演化历史具有重要的意义。长石是铝硅酸盐矿物,铝在晶体结构中是四次配位的,形成[AlO_4]四面体,它和[SiO_4]四面体一样,起着相同的晶体化学作用。也就是说,在长石中,铝和硅是类质同象置换的关系。铝置换硅时,是随机地置换呢,还是选择性地置换?如果是随机地 The study of feldspar is of great significance for accurately identifying the rock and discussing the formation and evolution history of rocks and deposits. Feldspar is an aluminosilicate mineral, and aluminum is four-coordinated in the crystal structure to form an [AlO 4] tetrahedron which, like the [SiO 4] tetrahedron, plays the same role of crystallographic chemistry. In other words, in feldspar, aluminum and silicon are isomorphic displacements. Aluminum is substituted for silicon, is it replaced randomly, or is it selectively replaced? If it is random