玉係東亞地區受歡迎嘅寶石之一,以礦物學分類,玉分為硬玉(即係翡翠,成分:NaAlSi2O6)同軟玉(透閃石、陽起石一類,成份)Ca2(Mg, Fe)5Si8O22(OH)2)。其它寶石,好多人都認為係玉石,包括蛇紋石、青金石、瑪瑙、珊瑚、大理石咁。中國東漢許慎著作《說文解字》解釋:「玉,石之美者」。
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/2/23/Jade_gisements.jpg/640px-Jade_gisements.jpg)
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