The basic feature of Hetian Biyu is the black spot in Jasper, which means chrome spinel. Its genesis is formed by hydrothermal alteration of ultrabasic rocks. Therefore, the elements of ultra-basic rocks are contained in cobalt, nickel and chromium, while other nephrites are not.
Jasper is a variety of Hetian Yuli. The largest output in China is the Marnas County in the southern margin of the Junggar Basin. Therefore, Jasper is also called “Ma Na Si Yuâ€.
Jasper is a soft, translucent nephrite with spinach. The color and structure are not very uniform. Sometimes it contains ribbons and chromophores formed by magnetite and epidote. The mineral composition of nephrite is mainly composed of tremolite-positive stone, hardness 6-6.5, and the chemical composition is silicate of magnesium, calcium and iron. The texture is fine, waxy or greased, and the hand feels smooth. Used to make crafts or utensils. The Chinese jade craftsmanship is accustomed to refer to the vast majority of foreign-produced nephrite as jasper.
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