【摘要】 NaAlSi2O6分子＞50％称为硬玉。按杂质元素将硬玉分为纯硬玉，钙硬玉、铬硬玉、绿硬玉。依据硬玉亚种及结构变化，划分为四个自然类型和11个硬玉岩类别以及与之相对应的11个翡翠玉种。硬玉岩的成矿作用有两个系列：纯硬玉－钙硬玉－绿辉石和（纯硬玉）－铬硬玉－氟镁钠闪石系列。前者参与成矿的特征元素是钠和钙；后者是钠、铬、镁。从残晶矿物提供的证据分析：前者发生在基性蚀变岩中；后者主要发生在超基性岩中。硬玉岩经受动力变质及叠加的热液改造，是形成中一高档翡翠的重要条件。更多还原

【Abstract】 Molecule NaAlSi2O6> 50% is called jadeit. It can be divided into pure jadeit, calcic jadeit, chromic jadeit and green jadeit according to impurity, and 4 natural types, 11 jadeitite classes and their corresponding 11 feicui jade species according to jadeit subspecies and tex ture variation. There are 2 series of jadeitite metallogenesis: pure jadeit-calcic jadeit-om phacite; (pure jadeit ) -chromic jadeit-F, Mg riebeckite. The characteristic elements in metallo genesis are Na and Ca for the former; Na, Cr and Mg for the latter. According to the relict mineral, the former occurred in basic altered rocks; the latter mainly in ultrabasic ones. And the important conditions of medium-high grade feicui formation are dynamic metamorphism and superimposed hydrothermal reformation更多还原