Hetian jade has been widely welcomed by the people. This kind of love originated from the jade worship thousands of years ago. At that time, jade was a god in the eyes of people. It can be psychic. Of course, no one thinks so now, but for Hetian. There are not many people who know the structure of jade. There are mainly six main structures of Hetian jade, felt-like cryptocrystalline crystal structure, micro-fiber-cryptocrystalline structure, micro-fiber crystal structure, micro-plate-like crystal structure, radial or braided crystal structure.
1, felt-like cryptocrystalline crystal structure: This is the most typical structure of Hetian jade, the performance: tremolite particles are very fine, the particle size can not distinguish its outline under the optical microscope, the size is uniform, interwoven into a felt. The Hetian jade with this structure is fine and dense, and is a characteristic of high quality Hetian jade. The structure is visible in white jade, white jade, sapphire, and jade, and is closely related to the texture of Hetian jade;
2. Microfiber-cryptocrystalline crystal structure: refers to a structure consisting of fibrous tremolite and cryptocrystalline tremolite, wherein the fibrous tremolite is arranged in a weak orientation;
3, microfiber crystal structure: tremolite mostly fibrous aggregate, roughly parallel distribution;
4. Microscopic cryptocrystalline crystal structure: refers to a structure mainly composed of flaky tremolite and cryptocrystalline tremolite. The content of flaky tremolite is not high and has weak orientation. When the hand specimen is observed by the naked eye, the flake-shaped tremolite exhibits speckle-like impurities; if it exists in a large amount, it will affect the quality of the jade, and it needs to be removed during the honing, so the jade texture with the structure is generally poor;
5. Microscopic sheet-like crystal structure: The tremolite particles are distributed in a leaf shape, and the jade texture with the structure is generally coarse and even has no economic value;
6. Radial or braided crystal structure: This structure is less in Hetian jade, which is another manifestation of fiber crystal structure, which is characterized by the formation of tremolite fiber particles in a braided shape accompanied by weak wavy extinction. phenomenon. It is inferred that under the condition of thermal deterioration of the aqueous solution, the tremolite is vigorously grown around the center and crystallized radially.
Hetian jade also has the following uncommon residual structure:
1. Residue structure: Residual minerals wrapped in plaque or crystallized tremolite, and intermittently connected with the same residual minerals in the matrix along the inner and outer layers of the residual layer. This structure shows that in the in situ recrystallization of plaque or metamorphic minerals, the corresponding components of the original rock are completely absorbed and excluded, and it is formed in an environment with weak stress and insufficient reaction. It analyzes the metamorphism of Hetian jade for us. The environment and conditions provide valid evidence;
2, the crown structure: the flaky tremolite along the crystal edge of the dolomite residue is regularly arranged (Plate I-6), which proves that the dolomite in the participation of the hot aqueous solution, in the crystal grain After softening, it forms a soft king, namely dolomite + SiO2 + H20 (steam) + tremolite.
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