Quality Evaluation of Tianshan Ice Jade
Tianshan Ice Jade is mainly used to make small pendants, bracelets, stringes, carvings, and a small part of the ring. Therefore, the quality requirements and evaluation of Tianshan Bingyu focus on the following points:
colour
The color is bright and pure, and the white color is the main one. If the white is like the sheep fat, it can be called the sheep fat jade, which is an extremely rare type of nephrite.
texture
The texture is dense, delicate, tough, smooth, oily and flawless, without cracks.
transparency
Tianshan ice jade must have a certain transparency, or exhibit a transparent texture after wearing for a period of time, and materials that are completely impenetrable are difficult to apply.
Blockiness
A certain block size is required.
Processing technology
If the concept of inlaid ice jade is ingenious, the color is new and the processing is fine, it will also improve the value of jade itself. For example, the traditional Chinese jade carvings such as “Shrimp Plateâ€, “Dragon Plate†and “Shui Man Jinshan†are known as national treasure carvings. Pieces.
Tianshan ice jade nature
Main components: The basic properties of Tianshan ice jade are almost the same as those of single crystal quartz, but the physical properties of the two are different due to differences in crystallinity and particle arrangement.
Mineral composition: The constituent minerals of Tianshan Ice Jade are mainly cryptocrystalline and crystalline quartz, and there may be a small amount of impurities such as mica, chlorite, clay minerals and limonite.
Chemical composition: The chemical composition of Tianshan Bingyu is mainly SiO2. In addition, a small amount of elements such as Ca, Mg, Fe, Mn, and Ni may be present.
Crystalline and Crystallization Habits: The main constituent of the Tianshan Ice Jade, the quartz is a trigonal system, which is a microscopic cryptocrystalline-polycrystalline aggregate. The outer appearance is mostly agglomerate, husk, and stalactite.
Optical properties: Tianshan ice jade is a high-grade quartz jade, colorless when pure, the difference in origin will lead to different impurity elements, such as Fe, Ni, etc., or when mixed with different colored minerals, can present different colors.
Gloss and transparency: The polished surface can be made of glass luster, and the fracture is generally glossy. The micro-transparency is half transparent.
Light: It is characterized by collective polarization, and there is no extinction position under crossed polarizers.
Refractive index: Tianshan Bingyu can only measure a refractive index value by point measurement, ranging from 1.53 to 1.54, and 1.55 can be measured individually.
Polychromaticity: Due to the non-directionality of cryptocrystalline or crystalline quartz arrangements, pleochroism is generally not observed in aggregates.
Absorption spectrum: generally no characteristic spectrum, only a few varieties can produce characteristic absorption spectra due to the presence of a small amount of color-forming elements.
Density: Due to the degree of crystallization and the influence of impurities contained in it, the density of Tianshan ice jade will change to some extent, generally around 2.60 (+0.1) g/cm.
Hardness: The hardness of Tianshan ice jade is slightly lower than that of single crystal quartz, and the Mohs hardness is about 6.5.
Form: The shape and texture of the Tianshan ice jade is suitable for engraving, so it has great value in the process. The transparent texture and appropriate hardness of the ice jade give the craftsman a rich imagination and provide a place for performing arts and crafts. Therefore, Tianshan Ice Jade has become a valuable species in jade.
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