The Xiuyan jade almost consists of pure antigorite,its grain size is 330nm×440nm, the grains distribute in the shape of wave along [WTBX]a[WTBZ] axis. The sequence of mineral crystallization is coarse tremolite fine tremolite-talc-antigorite. The colors are controlled by the content of TFeO and Fe2O3/FeO ratio, which are also related with transparence. Green and glossy green are original colors. Brown and red brown, which are secondary colors, were formed under oxidation conditions Colors and transparence are main quality parameters of Xiuyan jade.