China distribute many jade resources,but the famous are Nanyang Jade, Jiouquan Jade, Youyan Jade, Hetian Jade. The density of nephrite is from 2.44 to 3.18 g/cm3.

1.Nanyang Jade: It is also called “Dushan Jade”. It is originated from Nanyang City, Henan province. It has a monoclinic crystal, it has fine texture, pure, glass-like lustrous radiant, it is transparent or semi-transparent, it has a hardness of 5.5 to 6.5, it has various colors, and its density is 2.44 to 3.18 g/cm

2.Youyan Jade: It is originated form Youyan town, Liaoning province. It is a variety of serpentine jade, its chemical fomula is Mg6[Si4010](OH)8, it is semi-transparent, it has wax-like lustrous after polishing, its hardness is 3.5 to 5.5, its density is 2.44 to 3.18 g/cm3, and its reflective index is 1.555 to 1.573.

3.Xiuyan Jade: It is originated form Youyan town, Liaoning province. It is a variety of serpentine jade jewelry, its chemical fomula is Mg6[Si4010](OH)8, it is semi-transparent, it has wax-like lustrous after polishing, its hardness is 3.5 to 5.5, its density is 2.44 to 3.18 g/cm3, and its reflective index is 1.555 to 1.573.

4. Hetian Jade: Hetian Jade is produced in Xinjiang province, from Shache to Tashenku'ergan and from Hetian to Yuzhen which are located in the north of the 1600-kilometer long Kulun Mountain. There are 9 originating areas for Hetian Jade. Hetian Jade is made of nephrite, a silicate of calcium and magnesium. It is a fibrous variety of the amphibole mineral series actinolite to tremolite, usually closer to actinolite. Its chmical formula is Ca2(Mg, Fe2+)5(Si4011)2(OH)2. It has a monoclinic crystal structure. It has green, black, brown, and beige colors. The Hetian jade is opaque, and has lustrous wax-like appearance after polishing. It has a hardness between 5.5 to 6.5. Its refractive index is 1.606 - 1.632, and density is 2.9 -3.1 g/cm3.