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General quality jade from texture, hardness, transparency, weight and color of five to judge. Jade jade's texture is the fine degree of Windsor. The difference between the king and one of jade stone to start fine, Wen Runjian knot, translucent, shiny, such as fat; the rough stone is dry, lack luster, but also more opaque. Hardness is the resistance to external forces jade (such as pressure, carving, grinding) capacity. The higher the hardness, the greater difficulty of processing, the better the quality of jade. Although the hardness index jade instruments detected by the internal crystal structure, but they generally use more operational characterization of hardness. Between the hardness of our common jade 4?? 6 degrees higher than the hardness of copper and lower than the hardness of the glass. In other words, jade carved out of the copper can trace, can also be glass depicts the traces. People often come through the hardness of different gem stones, jade stones. In general, the hardness of stones more than 7, such as diamond, ruby, sapphire, emerald gem, but the Opal gemstone are exceptions, its hardness is 5.5; high hardness and hardness of the stone, between 6-7.5 if and nephrite, Nanyang jade, emerald; low hardness hardness of jade between 4-6, such as turquoise, Xiuyu (some snake texture Yu Shi lower hardness can lower to 2.5). Less than 4 minerals, generally no longer referred to as jade, which had called stones. Addition to characterize the hardness, there is a standard called the compression hardness hardness or indentation hardness, that is the absolute hardness, which refers to the capacity of striking force against the outside world, in the jade industry, also known as toughness. Compressive in nature is the highest hardness of Black King, marked as 10 degrees, followed Hetian, compressive hardness of 9 degrees, Emerald, Ruby, Sapphire is 8 degrees, diamonds, crystal, aquamarine, etc. for the 7-7.5 and so on. Said another way, and the compressive hardness of nephrite 1000, Emerald was 500, Xiuyu 250, while only 5 agate. And nephrite, such as those with high toughness is due to the distribution of its crystal like woven blankets, like, a huge force between molecules. In practice, Yu Jiang usually through observation port to see the jade ballast, generally cut a small piece, with a small hammer down, observe the fracture, and toughness for the glass of the relative terms. Toughness of jade, not easy to play the fracture, even if the fracture, the fracture is also uneven; the glass of jade the fracture through the bright section, called "light ballast", similar to the shell shape. Between toughness between the jade and glass, often called "bad", and "meat" of their ballast population of granular, parallel bundles, needles and so on. With this observation, but also whether the cleavage observed characteristics of jade, if cleavage, or crack, in the beating, the jade will crack along the direction of cleavage, or disconnect. So you can see, excellent toughness of jade?? And nephrite, in very strong processing plasticity, hardness in the same or higher than the hardness of the gem stone which, and nephrite carving process, incised lines will not collapse from the ballast from the port, so its fine texture, moist and Ze. Of course, the same hardness and toughness by the impurities of jade, by determining the toughness, hardness can understand their impurity. ?? This is a decision to use a piece of jade of the larger factors such as production of Yushan son of the jade ware magazine is not very strict requirements, but do jewelry accessories, calls jade pure, uniform. Jade jade hardness is an important basis for identification of one of the gem's luster is also a gem identification of the authenticity and grade level of the basic standards. General, gem of the gloss in the light intensity can be simply classified as "Can Light," "burning ray", "Flash" and "low light" several. Can the strongest brightness alone, people should keep our eyes narrowed to, for example, a good diamond grinding surface on the total reflection of light with such brightness; burning brightness of light is also high, shining bright, high hardness after polishing stones generally have burning brightness; flash light general level of glass, divided into strong and weak flash flash, high hardness of jade is usually strong flash, low hardness of jade for the weak flash; and low hardness of stone surface after polishing, while a weak bright light intensity. In addition to the degree bright, shiny gem identification is one of the characteristics. I am an expert from steelslittingmachine.com, while we provides the quality product, such as steel slitter machine Manufacturer , steel bar cutting machine, steel slitters,and more.
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