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rhodium jewelry suppliers Baolong Sharing: Cleavage and Fracture of Gems

投稿しました による kingjy

Under the action of external force (such as beating, squeezing, 等), gem crystals can regularly crack along a specific crystal direction to form a smoother plane. The property is called cleavage. These cracked surfaces are called cleavage surfaces. The cleavage surface is related to the atomic structure of mineral crystals, and is usually the weaker bond of gemstone atoms. Cleavage is one of the most stable properties of crystals. According to the difficulty of the cleavage surface,

一般的に, the cleavage of gem minerals is divided into four levels: extremely complete, complete, 中くらい, and incomplete. The extremely complete cleavage gems often have stepped cleavage surfaces on the section. The development of cleavage will affect the polishing effect of gemstones. Avoid making facets parallel to the direction of the cleavage surface during processing. 例えば, when topaz is processed, there should be an angle of at least 5 degrees between the table and the bottom surface of the columnar crystal. The cleavage of gemstones is also very useful for cutting certain gemstones. 例えば, diamonds are the hardest gemstones in nature. Splitting diamonds along the cleavage direction is the secret of experienced craftsmen in ancient times, saving materials and troubles.

Under the action of external force, gem crystals crack into flat and smooth planes along a certain crystallographic direction, which is called cracking or cracking. The cracked surface is called cracking surface. Cracking is a directional fracture caused by non-inherent other reasons. It is mainly caused by the sliding formation of the crystal lattice under directional pressure or the interlayer of other substances distributed between the surface meshes in a certain direction of the crystal lattice.

The fracture is the fracture surface where the gemstone is broken by a strong knock. The fracture does not split along the cleavage surface, but a non-directional and irregular fracture surface. したがって, the different shapes of the fracture can help identify the gem. The shape of the fracture can be divided into: shell-shaped, jagged, multi-sheet, granular, uneven, and so on.

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