Jade has the reputation of the king of jade. It is a jadeite in jade. Its chemical composition is sodium aluminosilicate. The mineral composition is a pyroxene-based pyroxene. The structure is composed of numerous fine fibrous microcrystals. A dense block assembly having a carpet-like structure. It is very tough, resistant to high impact forces and pressures, and its products are durable. Jadeite has a hardness of 6.5-7 Moss, a specific gravity of 3.3, a glass luster or a pearl luster, and is often translucent, and a few are transparent (fully transparent "glass"), and the fracture is staggered. In China's gemstones, there is a saying that Huang Wei is green and green is green. The origin of the jadeite is mainly concentrated in the Archaeological Area of ​​Myitkyina in northern Myanmar.
How to choose jade?
Should look at its "species", "color", "work". Species: refers to texture, structure, transparency and water head. The texture should be firm and fine, clean, the background color is coordinated, uniform, tough and not brittle, the gloss is strong, the treasure is heavy, and the structure refers to the size, shape and arrangement of the mineral crystal grains of jade. The finer the particles, the more uniform the better, and the denser the tissue, the better. Transparency and head, the head is jargon, which means the transparency of jade, the higher the transparency, the better the head, the better. Color: refers to the color of jade, jade is multi-color jade, color is one of the most important factors determining its value. Generally speaking, emerald green is the most expensive, violet, blush, cyanine, bean green, oil green, claw green, etc. Second, gray and white are the cheapest. Color requirements: thick, dark and powerful; Yang: bright and bright colors, pretty: beautiful colors, positive: bright and pure colors, no evil, and: uniform color and not flowers. Work: refers to the level of jade carving, which includes the selection of materials, modeling and carving techniques, requires exquisite design and fine workmanship. A good eagle can make the jade reach the real world, and the view is the realm of sigh.
What is "Old Pit Jade" and "Xinkeng Jade"?
Generally, the emerald gravel produced in Myanmar, which has been mechanically weathered and river water transported to river valleys and riverbeds, is called “old pit jade†or “letterâ€. This jade is characterized by “good water headâ€, strong quality and high transparency. Its top grade is transparent like glass, so it is called “glass piece†or “ice typeâ€. The green and green color is lovely, it is called “high green†or "Bright green." The jade jade material newly extracted from the original place has no weathered skin, and its water head and luster are worse than the old pit jade. It is called “Xinkeng jadeâ€, also known as “mountain materialâ€.
In the jade industry, the transparency is called “water headâ€, the transparency is called “water head footâ€, and the poor transparency is called “no water head†(or dry bar). For a jade jade, when the color is good (there is green ), the water head is enough, it is called "colored and kind", its value is high, on the contrary, the color is good and the head is poor, it is called "colored and no species", the head is good and the color is poor, it is called "there is a kind of colorless", the second The value of the person is low.
Hetian jade:
Hetian jade refers to the oldest nephrite produced in Hetian, Xinjiang. Its chemical composition is calcium magnesium silicate, and its mineral composition is a special aggregate composed of hornblende. Mohs hardness 6-6.5, specific gravity 2.9-3.1, fracture staggered, grease luster, translucent to opaque, color is white, cyan, yellow, black, red, etc., the color of a piece of material is generally uniform, its chemistry The composition is relatively stable, can resist strong acid and alkali, and is generally used for making jade carvings and various small pendants and bracelets. It is also the main material of ancient jade products in China.
Saitama:
The main producing area of ​​Daiyu is Xiuyan County, Liaoning Province, which is also produced in Xinyi, Sichuan and Sichuan Huili. The chemical composition of Saitama is a hydrated magnesium silicate. The mineral composition is a collection of snake and stone minerals. It is composed of fine fibrous and leaf-like serpentine crystals. It is a very delicate and dense block. . It is available in a variety of colors, which are uncommon in pale green and yellowish green. It has a hardness of 2.5-4.5, a specific gravity of about 2.5, grease luster or waxy luster; translucent to opaque, and very few are transparent, similar to plexiglass. Due to its low hardness, Shaoyu is a low-grade jade material. It is often used as a jade carving and various small pendants. It also makes life products such as tea sets, wine sets, fitness balls and jade pillows.
Dushan jade:
Dushan jade is named after Dushan, which is 8 kilometers northeast of Nanyang City, Henan Province. Its mineral composition is the eucalyptus petrified plagioclase, which is a multi-color jade. Its color is bright, the pattern is complete, the combination of light and shade, and the texture is delicate, dense and hard. Mohs hardness 6-6.5, specific gravity 2.9; glass luster or grease luster, opaque or micro-transparent. Dushan jade is commonly used in the market to make jade carvings of various ornaments.
agate:
Agate refers to chalcedony with a ribbon structure, which is a gelatinous mineral whose main component is silica. The hardness is 6.5-7, the specific gravity is 2.65, the fracture is shell-shaped, transparent to translucent, and the glass is shiny. Agate quality should be white, due to the presence of colored ions or other impurities, will appear gray, red, blue and other colors. The natural red agate is “burned red†and the heat treatment makes the light red agate turn bright red. High quality white agate can also be dyed in a variety of colors. Bracelets are often made on the agate market, and some small pendants and ornaments are also made. Agate mainly produces Brazil, and the main producing area of ​​agate in China is in Fuxin City, Liaoning.
crystal:
Crystal is one of the narrow gemstones and is a very old gem. Its chemical composition is silica. This is a crystal that is transparent like water in quartzite minerals (although crystals are opaque, they can only be called quartz crystals). If it is purple, brown or black due to impurities, it is called amethyst, tea crystal and ink crystal; the special variety containing needle or fibrous mineral inclusions inside is called "crystal". The crystal face is glassy, ​​and its shell-like fracture is grease-like; the hardness is 7, the specific gravity is 2.66, and it has a pressure-sensitive and optical property. Crystals are widely used in jewelry. They are mainly used as bracelets and necklace beads. They also make small pendants and ornaments. Crystals are mainly produced in Brazil and Uruguay. The main producing areas in China are Yangjiaoling in Hainan Province and the East China Sea in Jiangsu Province.
Natural crystals are clear and transparent, often containing star-like, cloud-like or floc-like gas-liquid inclusions, and microcracks are often seen. Synthetic crystals have no cracks, but often have small bubbles. In addition, the amount of synthetic crystal can be felt by hand to be larger than natural crystal.
Compared with glass, the crystal is white and bright and dazzling. The glass white is slightly blue, yellow and bright. The crystal hardness is 7, the glass is 5.5, the crystal can be used to cut the glass, the natural crystal often contains uneven cotton, etc. Phenomenon, and the glass is artificially baked, often uniform without cotton, and has tiny bubbles. The tongue crystal has a cool feeling, and the glass has a warm feeling.
"Hibiscus Stone"
Furong stone is a kind of pink translucent to transparent quartz block, also known as "Rose Quartz". Its chemical composition is mainly silica. In addition to pink, it is also dark pink. The hardness is 7, the specific gravity is about 2.65, and the fracture is shell-like, showing a grease luster. Mainly used as necklaces, bracelets, and sometimes some small pendants or chicken hearts and earrings and other accessories, Furong stone mainly produces Brazil, China's main producing areas in Xinjiang, Yunnan and other places.
Dongling Stone:
In the geology, Dongling Stone is called chrome mica quartzite with a hardness of 7. and a specific gravity of 2.65. It is brittle, translucent and has a staggered shape. According to its color, it can be divided into green Dongling Stone, Blue Dongling Stone and Red Dongling Stone. Dongling Stone mainly produces India, also known as Indian jade. Often used as necklace beads and bracelet beads, small pendant accessories, also have ornaments.
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