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Agate is a colloidal mineral. In mineralogy, it belongs to the chalcedony. Since ancient times, agate has been popular with people. One of the ancient "seven treasures" is agate. Because of the beautiful pattern, agate has been used by people since ancient times. In the jade unearthed, a string of agate balls is often used.
Agate is generally translucent to opaque, with a hardness of 6.5 to 7 degrees, a specific gravity of 2.55 to 2.91, and a refractive index of 1.535 to 1.539. The history of agate is very far away. It is one of the earliest gem materials used by mankind. Agate can be formed in both igneous and sedimentary rocks in various geological history. So, there are a lot of agates. China's agate production area is widely distributed, almost all provinces, mainly Heilongjiang, Liaoning, Hubei and other regions. It is also abundant in the whole of Europe, North America and Southeast Asia. The world's most famous producing areas are India and Brazil.
Agate is mainly produced in volcanic rock fissures and cavities. It is also produced in sedimentary rock layers. It is a colloidal aggregate of silica. Like crystal and jasper, it is also a kind of quartz ore. Its chemical composition is also silica. Its hardness exceeds that of crystal. Agate itself has the characteristics of hard, dense and delicate, different shapes, high finish, beautiful color and rich colors. It is the finest material for carving art and crafts, plus the advanced technology and perfect art of craftsmen. The combination gives it a peculiar idea, rich themes, ingenious design, and superb carving. Make the artistic effect of its performance extraordinary and superb. There is a mantra in the jewelry line, agate, no red, and poor. This shows how important the red color of agate is.
In fact, agate is rich in color and various in variety, but red is the main color in agate. Because the natural red agate is less, and the color layer is not deep, the red color in the agate is mostly red agate. Its red color is red, purple, deep red, brown red, red sauce, yellow red and so on. In addition, the color is red and bright, the brocade agate, the red and white ginseng, the broccoli agate or the safflower agate. For the jade carving products, the block is large, and the jewelry is inlaid with stone.
Agate is a large variety of jade carvings. It is used in large quantities and is mainly red. It is cleverly lined with other colors and textures to make the agate feature outstanding. It is also useful for other colors, with various colors, and the effect is also remarkable. The highly skilled jade carving masters use ordinary skills to make ordinary agates a valuable art treasure.
The mineralogy of agate is called chalcedony. The ancients called the red agate a red jade, or "Joan." Agate is more jade, so it is called red jade.
The texture of the agate is crystal-like, fine and non-impurity, shiny glass, transparent or translucent. It is mostly layered, and the layers overlap each other. They are corrugated, concentric, mottled, layered, etc., and also have pure white. The colors are red, white, yellow, blue, black, purple, green, gray, brown, and the like.
Because of the rich patterns and colors of agate, there are many varieties, so there is a saying of "dry agate".
The blue agate is light blue, the color is light, and the blue is better, much like sapphire. The output is tuberculous, and there is often a tangled phenomenon. In the past, it was mainly used to grind jewelry and snuff bottles, and the big ones were good materials for jade carvings. The blue agate is different from the egg agate. The egg agate belongs to the white agate. When the fire turns white, the cyan is dark and blue. The blue agate does not fade through the fire and is more expensive. Artificially dyed blue agate has been popular in the market for many years and is dyed with cobalt dye.
Green agate is rare in nature, mostly artificially dyed, colored with white agate or egg white agate, and the colorant is chromium. The dyed green agate is very similar to the emerald green, but the recognition is easier. The green color is inevitably flashing a little blue, which is evidence. Because it is like jade, it is very popular in the market.
Purple agate is better with grape purple. This kind of agate has a rough texture and a slightly low transparency. It is good for color and can be used as jewelry. The large piece is also a good material for jade carving.
Wrapped agate is an agate of various colors intertwined in the form of a ribbon. Because the phase ribbon is as thin as a piece of oil, it is called a snail. Some are red and white, some are blue and white, some are black and white, or as wide as a belt, or as thin as silk, very beautiful, the ancient name is cut agate. Wrapped agate is also a variety often used in jade carvings.
The black flower agate must have other colors that are strongly contrasted with black, and it is black and beautiful. The other colors are mostly porcelain white and white. Of course, in addition to these two main colors, there are more colors, but various The color should be bright and bright. The use of black flower agate to make some animals such as pandas is very popular.
Weed agate, also known as moss agate, is a variety of opaque color in agate. The colors are various, the green is the most common, and the flakes are in the light, like needle-like grass leaves in it, so weed weed agate, the color can be used as jade carving.
The central part of the water agate agate has different characteristics, solid, careless, hollow and waterless, and hollow and watery. The agate with water in the center is called a water agate, a precious species in agate, which is a rare treasure in ancient times. Water agate agate is more daring, and the higher the transparency, the better.
White agate is rarely used in crafts, most of which are used in instrumentation. But since it has been artificially dyed, its importance has begun to grow.
Because agate has a skin, it is rough and opaque, and it is also finer, so it is generally used after heat treatment. At the same time, the natural red agate color is not bright, but also after heat treatment, it turns from brown red, sauce red to bright red, and egg blue turns white. Therefore, the heat treatment of agate has become a common procedure for making jewelry.
Since ancient times, agate and pearl have been listed as treasures. However, today's agate is widely used because of its large output. Because its production is spread all over the world, its value is not high. It is a low-grade material and jade carving crafts. Prices in the jewelry market are also relatively low.
At present, for the dyed agate, the new national standard is not strict and is considered acceptable. Because it is an improvement process, it is not necessary to indicate.
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