1, Beijing White
Jingbaiyu is a dense quartzite with pure white color and delicate texture, which was named after its discovery in Xishan area of Beijing in 1960s. Later, similar white quartzite was found in Hunan and other places. In order to unify the name, some experts suggest using the name of "Crystal White Jade" to show the characteristics of the time, including white quartzite jade produced in various places.
Beijing white jade is a kind of pure quartzite, with the content of SiO2 _ 2 above 95%, uniform color, generally pure white, and sometimes slightly blue, light green or gray tone, without impurities. The timely particles are fine, the particle size is generally less than 0.2 mm. The texture is fine and slightly transparent. Good quality, as white as suet jade after polishing, but not as "moist" and brittle as suet jade.
2. She Taicui
A kind of jade produced in Inner Mongolia was only mined in 2007. In 2008, it was officially named "She Taicui" by well-known experts in China's geological and stone jewelry circles. It is understood that "She Taicui" was formed18-2.4 billion years ago, and it is a jade variety among Chinese jade species, similar to jade. In a narrow sense, Shetaicui mainly refers to the jade mine produced in Dashetai Town, Urad Qianqi, which has three basic colors: emerald green, white and cyan. This kind of jade is produced in Dashetai area, Urad Front Banner, Bayannaoer City, Inner Mongolia, with a proven reserve of 4 1.900 cubic meters. With the continuous exploration and exploitation of new mines outside Dashetai Town, Shetaicui in a broad sense has included similar quartzite jade in the surrounding mountainous areas, and aquatic plants such as Shetaicui, Violet Shetaicui, Iced Shetaicui and Yinshan Yuxue have been discovered.
3. Mi language
It is named after it is produced in Mixian County, Henan Province, also known as "Mixian Jade", "Henan Jade" and "Henan Cuisine". The timely particles in Mishan jade are very fine, which is difficult to be recognized by the naked eye, so it is as fine as nephrite. Usually slightly transparent to translucent. The color of secret jade is mainly green and orange-red, but green is the main color. Its green color is usually apple green, which is fresher than the dark green of jasper, and has color difference than emerald green, and often changes in color depth, that is, with the distribution of green scaly sericite, it changes in green depth. Jade is white with or without sericite. Usually, the green color of Mi language is lighter than that of dark green Dongling.
4. Gui Cui
Produced in Dachang, Jinglong County, Guizhou Province. It is a fine-grained quartzite jade containing kaolinite. Mainly light green, with blue-gray tone, but also green, so precious emerald, also known as "Guizhou jade." In addition, there are varieties such as grayish yellow and red. The green color of Guicui is caused by green kaolinite, so the color is not as bright as Lingshi and Miyu, and there is no scale flash. Kaolinite is unevenly distributed, so your emerald color is uneven. It contains soft minerals such as fluorite, calcite and high clouds, and the jade is homogeneous.
5. New Cuisine
Produced in the mountainous area dozens of kilometers away from Myitkyina, Myanmar. The mine is located in the mountainside area at an altitude of more than 2000 meters. The well-known mining areas in Myanmar are often crystal green or white green, and red and yellow varieties can also be seen. The specific gravity is mostly between 2.0 and 2.3, and the Moby hardness is about 7. Jade material itself is relatively transparent. Because it is produced in Myanmar and close to the origin of jadeite, it has been mixed in jadeite ice and sold at a high price. However, due to the geological relationship, the density and hardness of this kind of stone is not as good as that of the jadeite in the old pit, and its color is mostly purple, light green, yellow and dark blue. It is commonly known as "new pit jadeite" (new jade) in the jade processing base, and it is mostly processed into small jade ornaments such as bracelets and pendants for sale, with high cost performance. The color of jade is relatively uniform and the structure of jade particles is obvious. Compared with Laokeng jadeite, jadeite has larger particles, relatively loose structure and scattered spots inside. After polishing, the finished product can see scattered flashing spots in the sun, so it is well distinguished from the genuine Kethleen or ice glutinous jade. It was once unable to obtain a jade certificate because of the great difference in texture, and was later recognized as quartzite jade by many authoritative organizations.
6. Dongling Stone
Originally refers to a kind of green quartzite jade produced in India, so it is also called "Indian jade". Because jade contains silky green chromite mica scales, Dongling stone has a feeling of shining stars, bright colors, green or blue-and-green and very beautiful.
In fact, today's "Dongling Stone" does not only refer to the green chromite quartzite produced in India. At present, quartzite with bright colors and unknown origin is usually called Dongling Stone. So there are green Dongling stone, blue Dongling stone, red Dongling stone and purple Dongling stone. "Dongling Stone" in a narrow sense refers to green chromite mica quartzite jade.
7. Tianshan white jade
Produced in Tianshan Mountains, it belongs to quartzite, also known as Tianshan white jade. Its hardness is 7, which is equivalent to jadeite. Jade is beautiful, resistant to acid and alkali, not afraid of sweat and dirt, white and beautiful. Suitable for carving Buddha statues and pendant bracelets. Xinjiang is also called Xinjiang white jade because of its origin.
8, Tuojiang Daqian Jade
Also known as Daqian Jade, Changhong Jade, Tuojiang Jade, Daqian Seed Jade, Tuojiang Water Jade, Tuojiang Color Jade and Yangtze Sister Jade, it is a general term for all kinds of seed jade produced in Tuojiang River Basin of Sichuan Province. Because the Tuojiang River originated in Jiuding Mountain, Maoxian County, Sichuan Province, there are many tributaries, and the jade produced is varied and colorful. In addition, the main stream of Tuojiang River passes through Zizhou (now Ziyang area in Sichuan and Neijiang area in Sichuan), the exile place of Changhong, a famous minister in the Eastern Zhou Dynasty, and Neijiang city in Sichuan, the hometown of Zhang Daqian, a famous master of Chinese painting, so the jade materials produced by Tuojiang River are honored as Changhong Jade and Daqianyu by jade players.
How to evaluate the quality of quartzite jade
1, process quality
Seasonal jade has a large output and low price, and the processing quality has a great influence on its value.
2. Color and texture
Color and texture are one of the most important factors affecting the internal quality of seasonal jade. Seasonal jade has various colors, and its texture is ever-changing. As long as the color is bright, the saturation is moderate and pure, it is a valuable color. As long as its texture has special expressive force and can be used as a "pretty color", it is a high-quality texture. If the color distribution is messy, uneven and featureless, then the texture is of little value.
3. Transparency
Transparency is another important factor affecting the quality of seasonal jade. High transparency and good quality. But the transparency is low, the mineral particles are obvious, and the quality of rough structure is low.
4. Special optical effects
Seasonal jade with special aesthetic value often has high value recognition, such as starlight hibiscus stone.
5, cracks and impurities
Cracks and impurities affect the purity of timely jade.
6. Size
Size is a relatively minor factor in evaluating seasonal jade, but under the same quality, the larger the size, the higher the value.
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