Several phenomena on the jadeite original stone are based on these phenomena to judge the value of the original stone:
( 1) Python
"Python" is a term to describe the raw materials of jadeite, which refers to the expression of green belt in jadeite in weathering crust. Generally, it is distributed on the surface of weathering crust in a convex zigzag vein, like a python coil, which is a basis for judging whether there is color and color distribution. Generally, the fine-grained dense structure has stronger weathering resistance than the coarse-grained loose structure, and the green part has stronger weathering resistance than the colorless part, so compared with the colorless light-colored coarse-grained loose structure, the green part of the fine-grained structure protrudes to form a python belt. The green belt of jadeite is mostly the result of diagenetic transformation. After diagenetic transformation, jadeite rocks are deformed and broken under the action of stress, and then hydrothermal solution containing chromogenic ions invades and ions metasomatism to form green belts. Therefore, the colored bands are mostly deformed and fractured bands, which are constantly folded and recrystallized under the action of stress and hydrothermal solution, forming arc jadeite bands with dense structure, which are reflected on the weathering crust. The shape, color, trend and inclination of python belt are important signs to judge the green change of jadeite.
(2) Songhua
"Songhua" refers to the green expression on the jade shell, that is, the shallow green expression inside or on the surface of the jade shell. Because the species, concentration and spatial distribution of chromogenic ions are relatively stable in a certain metallogenic time and space, we can infer the internal color change and distribution of jadeite according to the shade, quantity and morphological changes of pine flowers. If the color of pine flowers is thick and bright, the value is high; If there are no pine flowers on the jade shell, the interior may be rarely colored; But there are many pine flowers on the leather shell, so there may be color in it or just color on the surface. In addition, whether the pine flower penetrates into jade and the depth of penetration are also one of the bases for inferring the color.
(3) tinea
"Tinea" refers to the appearance of black, dark green or gray marks of different sizes and shapes on the surface of jadeite raw materials. It is a performance characteristic associated with emerald green and a provider of chromium ions, commonly known as "ringworm eats green" or "green with black". The main mineral component of tinea is alkaline amphibole, which is usually columnar, fibrous aggregate, indigo and blue-black. A marginal or complete explanation is often given around pyroxene, especially jadeite, and it has obvious color change with the material around the shell. If there are a lot of flaky ringworm on one side and a lot of punctate ringworm on the other side, it may be that there are too many minerals such as actinolite, resulting in ringworm inside; If some ringworm is only on one side, and it is all flaky ringworm, it may just be a little "dirty" on the surface, which will not have great influence; If there are ringworm on two or even three faces, it may be dirty inside.
(4) Fog
"Fog" refers to a foggy opaque substance existing between the outer weathering crust and the inner jadeite, which is actually the result of the retrogradation of a jadeite mineral. Due to the decrease of temperature and the increase of pressure, the primary mineral jadeite degenerates, forming a new secondary mineral wrapped around jadeite, forming a pattern that the central part is jadeite, the external part is secondary mineral layer, and the outermost layer is weathering crust. These secondary minerals are mainly albite and nepheline. The fog is thick and light, and the colors are white fog, yellow fog, black fog and red mist. The existence and color of fog reflect the information of original rock, and the appearance of fog is the symbol of emerald color. Different colors of fog have different indicating functions. Red mist and yellow fog are caused by high iron content, and high-speed rail darkens the emerald green. White fog shows that the iron content is not high, it is pure jade, and it may be green and high green.
(5) Leather shell
The jadeite original stone is the product of weathering during geological transportation, which is called "skin shell". If the skin is rough and sandy, the jade stone is called sand stone. According to the color of sand skin, it can be divided into white sand skin, yellow sand skin, iron sand skin and black sand skin Among them, white jade often has no color inside, and if it does, it is light green or purple, but it is generally transparent; There may be more green in the original stone of Huangshapi jadeite, but most of them are uneven in color, and sometimes there may be more colored roots. It is generally believed that the iron sand skin is very thin with good internal quality and can produce high-grade materials. Black sand skin is dark black and green. It is generally believed that there will be dark green parts in it, and even green jadeite can appear. However, the original stone of black sand skin jadeite is very different, some are green with black spots, some are dry green, and some are dirty green. Lime skin is gray and soft, which can be brushed off with an iron brush. Most of them are caused by kaolin, and the internal germplasm is generally good. There is also a kind of fine water stone skin, which is smooth and has no sand feeling to the touch. This kind of skin is very thin and has many colors, such as brown, cyan, light yellow and so on. Because the skin of Shui Pi stone is very thin, strong light can penetrate it, so it is easier to judge the situation inside. Generally, the jadeite of Shui Pi Stone has been transported for a long time, and the dense and delicate parts have been preserved, so the quality is generally good.