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俄罗斯极地乌拉尔Сыум-Кеу超基性岩体中的硬玉岩呈脉状在以叶蛇纹石为主的蛇纹岩中产出,硬玉岩由硬玉和绿辉石组成,根据硬玉岩的颜色、结构和构造可划分出三个世代,可能对应存在三期硬玉化过程。第一世代硬玉为主体,灰白色,粗粒结构,致密块状,硬玉分子(Jd)含量54%～88%;第二世代硬玉发育在灰白色硬玉中,呈浅绿色,细粒-隐晶结构,细脉状-囊状,硬玉分子(Jd)含量74%～86%;第三世代硬玉呈绿色-深绿色,半透明-透明,中-细粒结构,瘤状。第二、三世代硬玉达到珠宝首饰级,具有较高的商业价值。根据硬玉岩的产状和晶体具有韵律生长环带及流体包裹体发育等特征,认为硬玉岩是在高压低温环境中由富含Na、Al、Si的流体直接结晶形成的。
Russian polar Ural Сыум-Кеу ultramafic rocks of the jadeite veins in the serpentinite-based serpentinite out of jadeite jadeite and pyroxene, according to the color of jadeite, Structure and structure can be divided into three generations, there may be corresponding to the three stages of jade process. The first generation of jadeite as the main body, gray, coarse-grained structure, dense block, jade content (Jd) content of 54% to 88%; second generation of jadedevelopment in the gray jadeite, was light green, The veins - cystic, jadeite content (Jd) content of 74% to 86%; the third generation of jade green - dark green, translucent - transparent, medium - fine structure, tumorous. The second and third generations of jade jewelry to achieve the level, with high commercial value. Based on the characteristics of jadeites and their rhythmic growth zones and fluid inclusions, the jadeites are believed to be formed by the direct crystallization of Na, Al, Si-rich fluids under high pressure and low temperature.