1, hetian jade is composed of amphibole actinolite. It is the main source of ancient jade in China. Produced in the foothills and riverbeds of Kunlun Mountain. Mainly in Hotan area. Its jade is hard and delicate. The mineral produced in the mountains is mountain jade, and the mineral produced in the river bed is seed material. According to the color, it is divided into: white jade, topaz, jasper, jet, sapphire, sugar jade and so on. The first-class white jade is pure and flawless, and is called suet jade. Other people with pure and flawless colors are hard to find and expensive.

2. Jing White, produced in Mentougou, Beijing, is a white and dense quartzite. The structure of fiber interweaving is different from other jade materials. But a granular structure. Its nature is fragile. The polished surface looks like suet jade.

3. Sheep fat is a gem-grade material in Hetian jade. It is the best quality of white jade, with the best luster and texture. Its characteristics are: moist, dense, clear and pure, white and flawless, like condensed fat, hence the name. The easiest way to distinguish this kind of jade from ordinary white jade is to watch it under white fluorescent lamp.

Facing the fluorescent lamp, the suet white jade is white and transparent, and it has a feeling of powder fog. The general white jade, although translucent to the fluorescent lamp, has no sense of powder fog. The biggest difference between the two is that white jade is visible to the naked eye regardless of its grade, but there must be different shades of light yellow under the white fluorescent lamp, so if there is a trace of light yellow under the fluorescent lamp, it cannot be called suet white jade. The rare suet jade that meets the harsh standards is definitely a gem that can't hold any impurities.

4. Nanyangyu is also called dushan jade. It is a kind of jade with complex composition and many minerals. Hard and delicate, the main components are plagioclase, zoisite, greenstone, amphibole and diopside. Based on green, purple and white, it often presents various colors. Jade workers carve different objects according to natural colors, which is suitable for the "pretty color" process. Nanyang fish has a long history of development and utilization.

5. She Taicui in Inner Mongolia: She Taicui was formed in the submarine siliceous deposit1.80-240 million years ago. After many geological tectonic movements and the infiltration of chromium-containing hydrothermal solution, quartzite mainly composed of chromium was formed, which was light green to white, translucent, hard and dense in texture, delicate and moist after polishing, bright in color and pleasing to the eye.

References:

Baidu encyclopedia-jade