The Three Types of Expression of Emerald "Cui Xian"

Emerald's "Cui-style" is an important symbol to distinguish between true and false jade. What is the emerald "cui sex"? It is generally believed that the emerald "chui" refers to the reflection of jadeite mineral cleavage surface that can be visually seen on the surface of jadeite, commonly known as "flies wings." Strictly speaking, the “chui-style” of jadeite should refer to the visual representation of the particle size and mutual combination of the main mineral jadeite jade in jadeite. "Flying fins" is just a form of emerald "cui sex"; with the different angles of observation of jade, emerald's "cui sex" expression is also different. To sum up, the concrete expressions of the emerald greenery can be summarized into the following three categories:

1, "Flies wings"

“Flying wings” refers to the bright white reflective features of the jadeite surface that appear like flies. The "flying wings" are mainly caused by the cleaved surface of Jadeite jadeite in the jadeite. They often appear as long strips or irregular slices, which basically reflect the size and mutual combination of columnar jadeite minerals. Because of the different size and orientation of various jadeite minerals in jadeite, turning the jadeite under the light, the flies of different parts will have flashes of different sizes, one after another, very characteristic.

However, not all flies will appear in the “flying wings”, but they are mainly seen in the incompletely polished and slightly rougher jadeite planes; they do not necessarily appear on well-polished surfaces, especially curved surfaces. .

2, "Orange peel effect"

The "orange peel effect" is that the emerald is on the polished surface. Through the reflective observation, there will be features like protrusions and depressions of different sizes and directions similar to the orange peel. The “orange peel effect” is mainly caused by the hardness anisotropy of jadeite minerals: the jadeite minerals that are aggregates in jadeite have different degrees of softness and hardness due to their different orientations. The relative hardness of jadeites with low hardness orientation is different. The hard jade with a high degree of hardness is relatively convex, so that a relatively uneven surface with convexities and depressions appears, thereby constituting an "orange peel effect". Therefore, the size and mutual combination of jadeite mineral aggregates can also be seen from the "orange peel effect" of jadeite.

It should be pointed out that some of the articles and books related to jadeite describe the “orange peel effect” as a feature of jadeite B cargo, which is not desirable. In fact, the "orange peel effect" was performed prominently in Jadeite A cargo, and the boundary between the bulge and sag was a gradual and smooth transition; Jadeite B cargo had a gap between the jade jasmine mineral granules due to the etching effect of strong acid. Obviously, there is not a smooth transition between the bulges and the dents. Instead, there is a gap separating them, forming a fissure pattern interspersed among the jadeite mineral particles and resembling a spider web. This is called "acid etched pattern." The orange peel effect is obviously different.

3, "Floc"

The “floc” is a transparent or translucent jadeite that is illuminated by sidelights or underneath light. Some cotton-like material appears inside the jadeite, also known as “cotton”. “Floe” is mostly due to the reflection of light by the interstices, fissures, and inclusions of jadeite minerals in jadeite, also called “intergranular optical effects”. Jadeite is mainly due to the appearance of jadeite mineral columnar, so "flocculants" are often elongated, and some can also show the outline of jadeite minerals, cotton wool intertwined with each other; and some imitation jadeite products, such as composed of albite The composition of quartz rock and jade composed of water foam particles or quartz particles are all large and granular. The observed “flocculants” also show the characteristics of sugar and granularity; the bainite cotton wool is lumpy.

It can be seen that the emerald's "chui-style" refers to the intuitive display characteristics of the particle size and mutual combination of the main composition of mineral jadeite in jadeite, and it only appears in the special mineral combination and mineral properties such as emerald. Therefore, it is one of the important means to identify jadeite in the daily jadeite trade. The observation techniques are: observe the emerald "fly flies" on the relatively rough surface of Jadeite; observe the "orange peel effect" through the surface reflection on a well-polished surface; observe the emerald mainly under transmitted light or side light irradiation. Internal "flesh" features. Through comprehensive observation and analysis, a more comprehensive understanding of Jade's "chui-style" characteristics, thus identifying jade.