Qinghai soft jade leather knowledge
According to its output status, jade can be divided into mountain material, water material and seed material. In recent years, there is also a reference to Gobi material. The leather material is the title of the skin jade on the mineral material. It is a residual or slope jade that is scattered around the veins. It is often close to the vein (not more than 200 meters) and should belong to the mountain material according to its output state.
The material shape of the leather material is obviously weathered and denuded. Although there is no seed material rounded Qinghai nephrite as a kind of Hetian jade has been recognized by the jade world, the leather material is considered to be one of the four outstanding varieties of Qinghai nephrite. This paper takes the leather material of the Weihe jade mine in Golmud City of Qinghai as the research object, and discusses the formation, distribution and the influence of the secondary environment on its jade quality. According to the state of production, jade is classified into mountain material, water material and seed material. In recent years, there is also a reference to Gobi material. The leather material is the title of the skin jade on the mineral material.
It is a residual or slope jade that is scattered around the veins. It is often close to the vein (not more than 200 meters) and should belong to the mountain material according to its output state. The material shape of the leather material is obviously weathered and denuded. Although there is no round material, there is no obvious edge and there is a weathered skin on the surface. In 1992, Qinghai nephrite began from the discovery of leather materials and is still regarded as one of the signs of prospecting today.
The special geographical environment of the Sanchahe jade mine makes the leather jade significantly better than the underlying mineral strip, which should be a special production state. The article describes it as Gobi material, which the author believes is wrong: the Gobi material is transported away from the vein by the flooding and is formed by wind erosion; and the leather material should be gravity-transported residual, sloped, and then cold. The products of the frozen weathering, the different jade qualities of the two are also quite different. Classification of leather materials 1. Classification by skin color (1) Black leather material: The surface of jade is black lacquer weathered surface. This jade is often scattered on the surface for long-term weathering.
(2) Yellow (soil) leather: The surface of the jade is earthy yellow, similar to the seed of the gold or autumn pear skin. It is hidden in 4-8 meters of sand and sand accumulation, so it is called soil leather. Yellow (soil) leather material 2, classified according to the degree of light received
(1) Yangshan material: exposed on the sunny slope of the mountain, the degree of light received is good.
(2) Yinshan material: exposed on the shady slope of the mountain, the degree of light received is poor or buried. The formation mechanism of leather 1. The formation and distribution of Qinghai nephrite Since the discovery of Qinghai nephrite in 1992, although there are jade found in Jiubagou, Yangpiling and Xiangyanggou, there are three mines with scale production. The types of jade produced are also quite different. The main producing area of ​​Qinghai nephrite and the jade species Huangkou material is the result of Ninghai soft jade. It is formed by the metamorphism of magnesia marble in the Wanbaogou group of the Proterozoic. The difference is that the small stove is a gneiss. The clip lens magnesia marble (Pt3Wnc) is a surrounding rock.
In recent years, Wuhan Comprehensive Rock and Minerals Testing Center analyzed the chemical composition of the igneous rocks of the Sancha River, and concluded that the magma of the Sanchahe jade mine is a basic gabbro, rather than the traditional granite and granodiorite. Due to different physical conditions, Make Qinghai nephrite unique.
2. The evolution mechanism of leather material formation Through the examination of the origin of leather materials and the research on leather collections, the author believes that the uniqueness of leather materials is closely related to the environment in which jade mines are located:
(1) The difference in condensation makes the leather jade superior to the ore belt jade mine with an altitude of 4200-4400Pt: it belongs to the island-like frozen soil area (annual average temperature -5 °C), and the surface jade is faster due to condensation. The cryptocrystalline crystal with incomplete crystallization is the fineness pursued by jade, and the jade (grain) is obviously superior to the underlying mineral strip.
(2) It does not have water conditions, and the main residual and slope accumulate in the Yinshan Mountain. The surface weathering resistance of jade is stronger than that of the surrounding rock. It is affected by earthquakes or glacier internal and external forces, causing it to be broken and stumped. Near the veins. Because the precipitation in this area is small (200mm, a) does not have the conditions for flooding, and the southern part of Kunlun Mountain is lifted, causing the jade fault block to be distributed in the north (yin) slope, and the perennial river is in the south of the mine, so the river is in the south of the mine. Qinghai soft jade has little water and no seed material.
(3) The degree of oxidation affects the oxidation of iron oxide contained in the formation of jade jade. It is a lagging and long process. The influence of external environment on the degree of oxidation makes the quality of jade different. The black leather material is directly exposed to the surface and fully oxidized; the yellow (soil) leather material has different depth and light receiving intensity, and the color and particle size of the jade stone are also quite different: the white jade color of the Yangshan material is uniform, the water line is slightly more; Poor sex, but jade is more delicate. The depth of burial of jade is 4-8 meters, which is related to the severity of the fault in the Kunlun Mountains in the near future, and the formation of aeolian sand (Q4eol) is relatively late. The scarcity and process of leather materials from the current data analysis, Golmud Sanchahe jade mine is the largest producer of white jade in China. In the early stage of mining, leather material is the main raw material for jade processing. Although there is a certain amount of production, due to a large amount of wear and tear, plus white jade The limited quantity makes high-quality white jade leather scarce, and today people can only pursue it in regret. Chemical analysis shows that Qinghai nephrite has insufficient iron content and insufficient oxidation degree, which is the main reason for white jade, and the white jade in leather is more pure due to oxidation.
Under normal circumstances, the leather material is finer (2-3 times) than the mineral material. Although the hardness of black and yellow leather in the leather material is different, it is generally higher than 0.5 degree of mineral material. The high yield, oily foot and good polishing property are unmatched. It is worth noting that jasper is rarely seen in Qinghai nephrite, and Cuiqing jade is a special variety in Qinghai nephrite. It has both the warmth of white jade and the fresh life of jade, especially the emerald color, which is more precious.
The jade sapphire leather material is thrown into the ground, especially the flaky black leather material. The knocking sound is crisp and melodious. The copper sheet material is called less and less. Today, when processing jade carving products, it will leave some skin color. Although this skin color does not hit the color of the seed, it traces the traces of nature carving, which is a recollection of people.
1. The leather material in Qinghai nephrite is a kind of jade that is condensed on the inside and outside of the Qinghai-Tibet Plateau, the environment, and the slope jade. It is different from the ore material and the Gobi material. It is a special output jade.
2. Compared with Qinghai nephrite, the ore belt has finer grain size, high color, high hardness, oily foot and high yield. It is considered to be one of the four excellent varieties of Qinghai nephrite.
3. The protection of leather materials in Qinghai soft jade should be increased. The environment in which jade is formed and the secondary effects that occur have a greater impact on jade, and research needs to be strengthened.
Women Night Dress,Casual Plus Size Dress,Dinner Dresses For Ladies,V-Neck Women Night Dress
Shaoxing Holly Garments Co., Ltd. , https://www.hollygarment.com