Characteristics of jade original stone

Jade stone is divided into two types: primary or secondary. Among them, the primary ore can be called the new pit without stone; the secondary ore is the jade raw material with various shapes and skins formed by long-term weathering after the emerald stone mineralization.

Emerald stone often has a layer of weathered shell. Due to the presence of the weathering crust, the interior of the jadeite could not be observed. The identification of the jade original stone is mainly to observe the various internal phenomena of the jadeite stone by observing various phenomena appearing on the surface of the weathered crust. The following phenomena often appear on the surface of the jade stone.

(a) leather shell

Most of the jade original stone has a weathered crust, that is, the product formed by the weathering of the jade original stone during the geological handling process, which is called the “shell”. If the skin is rough and has a grainy jade stone, it is called sandstone. According to the color of the sand skin, it can be divided into: white sand skin, yellow sand skin, iron sand skin, black black sand skin and so on. Among them, white sand skin jade interior often has no color, if it is also light green or purple, but generally good transparency; yellow sand skin jade original stone may have more green inside, but most colors are uneven, sometimes there may be more intense colors Root, it is generally believed that the skin of the iron sand skin is very thin, the internal quality is good, and the high-grade material can be produced; the black black sand skin is darker black and green, and it is generally considered that there will be a deeper green part inside, or even full Green jade, but the black sandstone jade stone changes very much, some inside the green with black spots, some inside is very dry green, some inside is very dirty; lime skin is grayish white, the skin is soft, available The iron brush removes the lime skin layer, most of which is caused by kaolin, and the internal general germplasm is better. In addition, there is water scouring, the skin is smooth, the hand feels no sand, and the water stone is fine. The skin is very thin and has a variety of colors, such as brown, cyan, and light yellow. Since the skin of the pebble is very thin, strong light can pass through, making it easier to judge the inside. The jadeite of the pebble is generally transported over a long distance, and the denser and finer parts are retained, so the general quality is better.

In short, according to the color, compactness, smoothness and thickness of the jade husk, the color, transparency, clarity and structure of the jadeite are inferred.

(two) pine flower

“Songhua” refers to the green expression on the jade husk, which is an expression of the interior of the jade or the light green on the surface of the husk. Since the type, concentration and spatial distribution of the photochromic ions are relatively stable in a certain mineralization time and space, the change and distribution of the interior color of the jadeite can be inferred according to the shade, quantity and shape of the pine flower color. If the color of the pine flower is thick and bright, the value will be high; if there is no loose flower on the jade skin, there may be little color inside; and if there are many pine flowers on the skin, there may be color inside or only on the surface. In addition, whether the pine flower penetrates into the interior of the jade, the depth of penetration, etc., is also one of the basis for inferring the color.

(3) 蟒

“蟒” is a term used to describe jadeite raw materials, which refers to the appearance of green bands in jadeite in weathering crusts. Generally, the convex zigzag veins are distributed on the surface of the weathering shell, just like a python coil, which is a basis for judging whether there is color or color distribution. The diagenesis and mineralization of the jade has different generations, forming structural and compositional differences, which leads to different hardnesses and different weathering during the weathering process. 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 that the green part of the fine-grained structure protrudes compared with the base of the colorless and light-colored coarse-grained structure. Forming a sash. The green strips of jadeite are mostly the result of post-diagenetic transformation. After the diagenetic period, the first deformation is the deformation and rupture of the jadeite under the action of stress, and then the hydrothermal intrusion of the colored ions is carried out to carry out ion exchange to form a green band. Therefore, the colored strips are mostly deformation rupture belts, and this rupture zone continues to wrinkle and recrystallize under the action of stress and hydrothermal fluid, forming a dense curved jade ribbon, which is reflected on the weathered shell. The shape, color, direction, and inclination of the sash are important signs for judging the green changes of the emerald.

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