"Because on the Opal, you will see the ruby ​​of ruby ​​or ruby, the gorgeous purple, the green of the emerald sea. All the colors are mixed in an incredible way to flash together" - Lao Pu Linni (first century AD)
Today, Xiaobian wants to talk to you about opals . Then someone is strange, since it is talking about opal, what does it have to do with Opal? You don't know this, because opal is mainly produced in Australia and is called "National Stone" in Australia, so it is Opal.
So what is opal? In fact, opal is a kind of gemstone whose color is like the color of protein. It is famous for its own color and unique luster. Its unique feature is that it mixes other elements into it, and it will form a variety of colors. The color that appears will change with the angle, and it has a rainbow-like beauty, so it is widely Female friends love it.
The opal is used as a gemstone, the English name is opal, and the Chinese transliteration is opal. It is a natural hardened silica gel (hydrate) containing 5-10% moisture. Unlike most gemstones, opals are amorphous and gradually dry out and crack due to moisture loss from the gemstone. Opal is an opal in mineralogy. It is a gemstone with a color changing effect and is an aqueous amorphous silica.
In ancient times, opal was second only to emeralds, and the Chinese were very fond of it. Wearing opal can inspire people's inspiration, imagination, and bring breakthrough, innovative thinking and ideas. It is a gem of talented and talented people. Strengthen personal abilities and talents, give decisive execution ability, and be able to make money. One of the essential gems for businessmen.
Opal also helps to increase the vitality, physical and pledge power of the body. Pink opal and powder crystal can also help love and enhance popularity.
There are two variants: precious opal and common opal.
The precious opal will show a color flash (i-color) due to the different viewing angles. Its iridescence is caused by its structure - a tiny arrangement of tiny silica spheres - which is caused by diffracted light. The larger the sphere, the more the color range Wide, so the precious opal has several different colors. The quality evaluation of opal is based on the base color, color change, firmness, and the perfection of cutting and honing.
species
According to color characteristics and optical effects, natural opal is divided into three categories: white opal (white opal), black opal (black opal) and fire opal (fire opal).
White opal
As a gemstone has a long history, its basic colors are colorless, egg white, light gray, light yellow and light purple. After honing into a curved gemstone, the surface will show beautiful color. The bottom color is white, and the color is brighter.
Black opal
It was known only after being discovered by Australians in the 20th century. Its color is black, dark green, dark blue, dark gray and brown, and black is the best. The black opal surface shows a lot of color changes, and it is particularly bright and dazzling against the dark black background.
Fire opal
It is a special variety in Opal. It is translucent to fully transparent and has a yellow and orange color. Since the diameter of the silica pellets constituting it is too small, it does not have a color change effect and belongs to a low-grade gemstone.
Distribution: Filling holes in caverns or ore in igneous rocks, forming stalagmites or stalactites, and replacing organic matter in fossil wood, animal hard shells and callus. Australia has been a major producer of opals since the 19th century. Others are the Czech Republic, the United States, Brazil, Mexico and South Africa.
Mother rock opal is more common in European and American markets, but is rarely known in China. It is produced in Australia and is very special due to the contact of silica-rich hydrothermal fluids with rocks in ancient times. Compared with ordinary opal, the parent rock opal is usually larger and the price is more intimate.
Chinese opal
The opal mine was first discovered in western Liaoning, and it was crystallized for many years in the cracks in the volcanic rocks in the mountains. Outside the red bell milk with red clay skin, white transparent, hardness 7.5, refractive index: 1.54, density: 2.65, light: cryptocrystalline aggregate, transparency: translucent, glass luster, blockiness, fine, moist It is very similar to glass jade. Close to the characteristics described in the ancient and the sacred, you can imitate the "transfer of the country." This mine has not been explored in detail, and mining is difficult and needs to be developed.
Xinjiang Hami Opal
There is also an opal produced in the Hami area of ​​Xinjiang. It is white, red, brown and red. It is moist and translucent. It can be used for exquisite carving materials and is highly respected by stone lovers. Usually, this opal leaks into the surface and shallow soil. After people pick up the stone, it is called opal because it has the light of cooked protein after polishing. In fact, this opal is agate further. The product obtained by losing water has little to do with the true opal.
Nanjing Yuhua Stone Opal
Among the stones are hydrous-solidified silica, amorphous hydrated dioxide gel. The most important thing in the process of playing the stone is the “rhymeâ€. The so-called “rhyme†we refer to refers to the transition of its unique color. The folk language is called “tour colorâ€. This is a very vivid depiction of the protein, which slowly spreads from thick to light, and almost no boundary between color and color, color and color. "Swim" is also the meaning of drifting. The color of the protein is also very rich, all kinds of color are available, the common ones are the blue, white and yellow series, and the rare ones are red, blue, purple, green and black. No matter what color, you can't "dry" and ask it to "run". There is no crack in the stone, and more than three colors are preferred. The finer the texture, the better, like the cooked chicken egg white, tender as baby's skin. In the rain stone opal, it is divided into many varieties. The lotus pond moonlight screaming teacher divides the yuhua stone opal into fine protein (fine opal with standard circle halo characteristics) according to the folk name of Nanjing Liuhe and other types of names. Proteins (the characteristics of the circle halo are not obvious, the particles with transitional halation are coarser), the specific proteins (the opals intertwined with other types of pebbles), and the stone proteins (the rough stones with a hazy transition).
At the same time, the rain stone opal is not only in Nanjing. The original gravel layer of Yuhuatai in Nanjing has been exploited for many years. Now there are few gravel layers. There are some gravel layers in the Huashen Temple, while Nanjing City, Nanjing Liuhe, Nanjing Gaochun, Yizheng Qingshan and Yuetang In other places, there are pebbles and opals, among which the opals produced in Nanjing Liuhe, Yizheng Qingshan and Yuetang are the most beautiful.
Identification
Opal is a member of the gem family. It is unique among many gemstones in its exotic colors. The opal is mainly made of silica which has been crystallized for hundreds of millions of years. This gemstone is warm and delicate, and it is a very precious gemstone. Nowadays, the consumer goods market is rather chaotic, and the phenomenon of sub-filling and counterfeiting in the market is endless. Therefore, the problem of identifying opals has become a concern of many collectors. How to identify opal? The following small series will give you a brief introduction.
Identification of opal: fantasy color
Opal is called "protein" because its color is similar to that of protein. Of course, this is just ordinary opal, which is often used as a building material. The high-quality opal brilliance is often used as an ornament or polished into jewelry. Opal is generally black, light yellow, milky white, orange red as the background color, and the actual color is very strange. What is the magical color of the opal? First, the color of the opal can change with the intensity of the light or the angle of the light. This is the color-changing effect of the opal. Second, there are many levels of color. Ruby, amethyst, emerald color can be collected on the same opal. There are many colors such as black, white, orange, yellow and blue. It is as colorful as a rainbow, and it is very beautiful. Moreover, the larger the particles of the opal, the wider the ribbon present on the stone.
Identification of opal II: unique structure
The opal is mainly composed of colloidal crystals of silica, and is an amorphous structure composed of silicon dioxide and water. Under the microscope, this structure presents a whole array of spherical micro-particles of silica arranged in the shape of stalactites or grapes. The general gemstones do not have this feature. Its hardness is relatively low, generally around 5 to 5.5 Mohs, and it is very easy to be scratched or broken. Once the opal breaks, the shape of the fracture is generally like a shell, which is also caused by the unique internal structure of the opal.
Identification of opals: diversity of species
The same is opal, its kind is different, and the quality will be different. The types of opal are divided according to their color, and are mainly divided into white, black and fire. Albumin is not necessarily white, it has several colors of protein, light gray, light purple, light yellow and transparent. After the best quality white opal is polished into a spherical shape, its background color is generally pure white, the color of the surface changes with the change of light, and the quality of the opal without color change is relatively low. The background color of black opal is generally black, brown, dark blue, dark gray, dark green and other colors. Under the dark light, the surface of black opal contains light, beautiful and beautiful. Among them, the black color is the most flexible and the quality is also the best. The background color of fire opal is generally orange or yellow, and is generally transparent. Due to the internal structure of the fire protein, and its own bright color, its surface does not have the flowing and colorful colors of the precious opal, so the texture of the fire protein is relatively general, not belonging to the ranks of precious stones.
Ok, is it listening to my heart? The heart is not as good as action! Remind friends that if it is a good gem, its appearance will change with the angle. On the contrary, it is just a decorative stone!
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