Crystal is a favorite of many people, but how to identify it is rarely known. The following describes some ways to teach you how to recognize crystal: (1) Seeing: In the process of forming natural crystals, it is often affected by the environment and always contains some impurities. When observing the sun, you can see the faint uniform small horizontal stripes or catkins. The fake crystals are often smelted with crystal slag and glass slag. After polishing and coloring, there is no uniform streaks or catkins. (2) Tongue: Even in the hot summer days, using the tongue to rub the surface of the natural crystal, there is a cold and cool feeling. Fake crystals have no cool feeling. (3) Illumination: The natural crystal is placed vertically under the sunlight, and it can give off beautiful brilliance from any angle. Fake crystals can't. (4) Hardness: The hardness of the natural crystal is large. Use the gravel to gently stroke the ornament, leaving no traces; if there are streaks, it is a fake crystal. (5) Check with a polarizer: 360 degrees under the polarizer is a natural crystal with four dark and four dark changes, and no change is a fake crystal. (6) Check with two colors: natural amethyst has dichroism, and fake crystal has no dichroism. (7) Check with a magnifying glass: Under the transmitted light with a ten-fold magnifying glass, the bubble can be found as a fake crystal. (8) Check with hair silk: Put the crystal on a hair silk, the human eye can see the double shadow of the hair through the crystal, it is natural crystal, mainly because the crystal has birefringence. (9) Detection by thermal conductivity meter: The thermal conductivity meter is adjusted to the green 4 grid test gems, the natural crystal can rise to the yellow 2 grid, and the fake crystal does not rise, and rises to a yellow grid when the area is large. Identification of natural and synthetic crystals: Another characteristic of natural crystals and synthetic crystals is crystal luster. The surface of natural crystal jewelry is oily and lustrous, but the synthetic crystal jewelry table shows the glass luster, and there is no synthetic crystal with rouge luster. . Crystal, although not a precious gem, is increasingly favored by men, women and children all over the world for its unparalleled medical effects and low price. As a fan of crystal, I hope to have all kinds of crystals, natural or synthetic, but he must know whether his crystal is synthetic or natural. Nowadays, the colorless crystal necklace and the citrine necklace on the market can be described as natural and synthetic blends, while the color crystal necklaces are mostly synthetic crystals. There are fewer real natural crystals, and fewer are used to make necklaces. The biggest feature of synthetic crystal is the presence of a daughter crystal nucleus. If the crystal is nucleated, it is better to judge because the crystal is generally a colorless long-plate column, and the boundary with the surrounding synthetic crystal is clear. However, some colorless synthetic crystals on the market recently are colorless due to nucleation and synthesis. In addition, there are some natural inclusion characteristics in the nucleus or some bubbles between the crystal nucleus and the synthetic crystal, which makes some experienced. It is easy for people to mistakenly think that it is a natural crystal. If you look closely, you will find out which kind of inclusions exist only in the child and the main body. There is a feeling that is surrounded by an invisible wall and breaks without delay. The bubbles between the nucleus and the synthetic crystal are distributed along the wall of the nucleus to form parallel "bubble walls". Some of the bubbles are shaped like a scorpion, and the heads are arranged outward toward the wall. Natural crystals often have clusters arranged along one side, but this surface is often single and undulating, and the inclusions that make up the surface are often found to be two inclusions under a gem microscope. Not just bubbles. The difference between the two is still obvious. The second characteristic of synthetic crystals, especially colored synthetic crystals, is the uniformity of smoke. The color of the whole necklace is more uniform, especially the yellow crystal series and the synthetic crystal of brown and black. The natural yellow and brown, black crystal colors are often not uniform. Natural crystals are not only uneven in color, but also often in tea tones (except for tin crystals). What is more interesting is that under the white light at night, the tea yellow crystal does not have a little yellow color. It is completely like a tin crystal, if it is mixed with tea crystal. Good identification. The synthetic citrine I have seen is pure and uniform in color, with individual shades that are darker, but without tea tones, and will not change color under nighttime white light. It is worth noting that in the synthetic amethyst, there are often some deep purple patches with good orientation, which are easily reminiscent of the characteristics of irregular swatches in the natural amethyst. The biggest difference between the two is that the deep purple chromophores in the synthetic amethyst crystallize in parallel with the flaky orientation, and the size and shape are not much different. The dark purple tablets are likened to the floating "purple cloth", which is naturally in the amethyst. The purple group can be seen as a floating "purple smoke group". This is the main difference between the two. Natural crystals, especially amethysts, have a feature that is a hexagonal ribbon like the sapphire. It is interesting to note that in some synthetic green crystals, parallel ribbons often appear, and the ribbons develop parallel to the sub-nucleus in layers. I have also seen a series of synthetic green crystal necklaces, yellow and green countryside, very similar to the natural crystal ribbon, plus some brown translucent solid impurities inside, it is easy to mistakenly think it is natural green crystal, but the formation of synthetic crystal The ribbon is distributed parallel along the wall of the sub-nucleus, and the angle between the objects is flat and the angle of the object is the same. The color spectrum of the necklace is the same, and the color bandwidth of each particle becomes the same, giving an excessive “step-by-stepâ€. Unnatural feeling. The third characteristic of synthetic crystals is that they are clean and flawless. Natural crystals often have inclusions and cotton, while synthetic crystals are crystal clear. Individual synthetic crystals have bubbles or some solid impurities. Recently, some synthetic crystals often have some triangular long tubular pores in which there are green flaming red powders. The long tube is characterized by parallel arrangement in one direction, the section is triangular, and there are often uneven green fire red powder distributed along the wall, the middle is often empty, and the end of the long tube has a tendency to become sharp. The true natural hair crystal is a crystal containing minerals such as tourmaline, actinolite, rutile, etc. These minerals have a gas crystal shape, such as the "bamboo-like" shape of the amphoteric stone. They are wrapped in crystals, arranged in a non-directional manner, thick and slender, short and different, often accompanied by inclusions and cotton inherent in natural crystal. Really like the crystal clear crystal, but afraid to buy fake fakes, why not learn a little bit of discrimination? Specific gravity: The weight is too light, it must be fake, so it can exclude glass, plastic, pressed particles and other imitation products, but now there are more crystals on the market, and its weight is similar to that of natural crystal. It is not easy to find true and false. Refractive index: Most people look at crystals like lighting, so it is impossible to judge the true and false of crystals, only the level of crystal, because crystal has a high refractive index. We can put the crystal in a darker place, the natural crystal color will be very bright, the color of the crystal will be dim, lack of pan-feel, only a slight brightness. You can compare it with natural white crystal and glass and feel it. Price: The crystal and the natural gem-quality crystal have one thing in common, that is, the crystal is very transparent, almost no stone, but the price is very different. Usually, the crystal hand beads will be made into a cutting surface, and the crystal is transparent. However, the price is generally not too high. However, if he is really a natural gem grade, the price must be more than 100 yuan, depending on the size of the crystal. Chromatic aberration: There is color difference in natural crystal. It is impossible for a piece of natural crystal to be uniform in color. For example, citrine, the natural citrine on the market is rare. Natural citrine can be discerned in water. The color of natural citrine in water is uneven. Usually, a piece of color radiates to the whole piece of crystal, which is yellow. The crystal is absolutely uniform. Others: The touch is cold, and the crystal with stone is basically not fake. Inclusions: There are no fakes in the contents, so buying crystals with crystals, ghosts and other connotations can be absolutely assured, because forging such things is costly and laborious, and the effect is easy to be see through. The fake crystals on the market generally have the following types: 1. Glass products 2. Smelting crystals 3. Lead-containing glass 4. Synthetic crystals 5. Regenerated crystals (nurturing crystals) Identify the true and false of the crystal with a simple polarizer. It consists of two polarizing plates consisting of upper and lower polarizing plates, which can distinguish between glass and crystal. Since the glass is a homogeneous body, put it in the middle of the refracting sheet holder. If you turn it anyway, the fake crystal will always be black; if it rotates 360 degrees in the middle of the refracting sheet holder, there will be four regular changes in light and dark light. Crystal is undoubted. The crystals currently used to make gems include colorless crystals, amethyst, citrine, smoky quartz and crystal. Crystal Rock Crystal is colorless and transparent. It is used to make crystal balls, jade carvings and crystal tops. Amethyst Amethyst is a purple-lace crystal, mainly used for making ring and jade carvings. Smory quartz light gray crystal, mainly used for jade carving. Citrine Citrine orange, brownish yellow crystal, mainly used as a gemstone face. Hair crystals contain crystal fibers such as amphibole and tourmaline. First, physical and chemical properties Crystal chemistry consists of SIO2. Trigonal crystal system. The crystal is a cylindrical crystal with a cone head composed of a hexagonal double push and a hexagonal column. Color: colorless, purple, yellow, brown, grayish black. Transparent. Gloss: Glass luster. The refractive index is 1.544 to 1.553 and the birefringence is 0.009. Hardness 7. The density is 2.66 g/cm^3. Shell-shaped fracture. Amethyst has a weak to clear dichroism. Second, the characteristics of the naked eye There are many kinds of crystals currently seen on the market, such as natural colorless crystal, citrine, smoky quartz, amethyst; artificially colored azure crystal, orange crystal, purple crystal, two-color crystal; synthetic colorless crystal and purple crystal. Since they look basically the same, they are not very different from each other. (1) The difference between natural colorless crystal and synthetic colorless crystal Natural colorless crystals and synthetic colorless crystals are mainly used in the unprecedented market for beaded tops and crystal balls. The main points of difference are inclusions and transparency. In the natural crystal necklace or crystal ball that is mostly effective, there will always be some defects. They are immersed or raised in the water. The naked eye will see some traces in some beads or crystal balls. A reflective surface with small cracks or a gas-liquid inclusion with a flocculent shape. In the synthetic crystal, the inclusions are less, the interior is dry, and almost no defects are seen. Transparency natural crystal crystal clear blue, the interior is clear, such as the faceted beaded necklace in the white porcelain pot filled with water, in addition to seeing the periphery of each bead, the middle of the bead and the water is clear, like nothing The feeling of being. The synthetic crystal is also very transparent, but after being placed in the water, the periphery of the bead is clear, but the middle is not as clear as the surrounding crystal water, and can feel the presence of beading. (2) Screening of natural amethyst and synthetic amethyst There are two differences between natural amethyst and synthetic amethyst. Color and distribution The natural amethyst is bright and soft, but unevenly distributed. The main stone is placed in the water, and purple plaques or flat ribbons are visible. The synthetic purple crystal has a purple shade, generally uniform, accompanied by gray tones, the color is not bright and somewhat dull. Even if some products are not uniform in color, they will gradually transition in lightness, and there will be no purple spots and straight bands. The natural amethyst of the inclusions can be seen in the tiger-like healing or cracked air-liquid inclusions. The synthetic amethyst rarely sees the inclusions, and occasionally only the thin plate-like colorless seed crystal central or white bread residue can be seen. (3) The difference between natural crystal and color crystal Natural crystals can be brown, brownish black, golden yellow, purple and two-color after being bombarded by ion accelerator or short-lived. In addition to the two-color crystal, the color of the other colored crystals is very uniform, and no smudges or ribbons can be seen in the water. The color of the changed crystal is always accompanied by a gray tone, and the color is not bright and bright with natural crystal. In nature, no crystals of two colors have been seen at the ends of the same crystal. Only two-color crystals of brownish and purple mixed with Bolivia are seen. At present, the two-color crystals on the market that are spread on both ends of the stone are colored synthetic crystals. The colored synthetic crystals are brownish green, brownish red, or pale and light red at the ends of the chamber stone. The borders of the two colors are straight and clear, and there are several straight stripes on the contact strip. (4) The difference between natural crystal and topaz Colorless or color-changing sky blue, orange crystal, the appearance is very similar to the colorless or color-changing sky blue, orange yellow topaz. The root of the naked eye is only that the reflective effect on the inside of the bottom facet of the faceted crystal is far less than that of the topaz. Although the reflection of the crystal is bright but does not have a mirror effect, the reflective surface of the topaz is very white like a small mirror. (5) The difference between natural crystal ball and glass ball At present, the crystal glass has two colors, one is a colorless glass (smelting crystal) which is a crystalless crystal for crystal ball; and the other is a purple glass resembling amethyst. The natural crystal ball is clear and transparent. In a small place, you may see a gas-liquid inclusion or a floc inclusion in a sheet-like spread. The glass ball made of smelted crystal, although transparent but not clear, seems to be accompanied by opalescence, and the touch of the hand has a warm feeling, and it may see circular bubbles when placed in the water. In addition, the natural crystal has birefringence, even if the birefringence is low, only O.OO9, but as the sphere increases, the two refracted rays will gradually separate. If the crystal ball is pressed on a newspaper printed with a small font, and viewed vertically from the uppermost end of the sphere, there are two phenomena: one is that the font is enlarged, and the writing is clear (the direction of the parallel crystal). If the sphere is rotated 90 degrees, in addition to the font enlargement, the writing is still double-shadow, and the larger the sphere, the clearer the double-shadow of the font. Because the glass sphere is a homogeneous body, the handwriting observed in the vertical sphere in any direction is very clear, but not the most double shadow. Purple glass imitation amethyst, transparent and flawless, purple uniform, can not see purple strips or spots fast. It may be seen in a circular bubble when placed in water or observed with a IO magnification magnifying glass. Observing inclusions is also the best way to distinguish between natural and synthetic crystals. The crystal ball in the former market is very popular, and in terms of its materials, it is mainly smelting crystal glass and natural crystal. Their prices are very different. How to distinguish them is not very difficult. It can be distinguished by a polarizer in a professional laboratory. However, we have a small identification in the general situation. In addition to visually observing the clarity and trace inclusions of the sphere with the naked eye, it is necessary to look for the phenomenon that the double shadow of the natural crystal can make the writing become blurred from different directions. The price of small-grain natural crystal raw materials and synthetic crystal raw materials is not much different, and the physical and chemical properties of the two are basically the same. If used for horror, it is not necessary to be excessively demanding. The method of identification is that they have different inclusions. Five-color crystals are produced in all countries. The main producers of Amethyst are Brazil, Uruguay, South Africa and Madagascar, as well as Zhongwei, India and the United States. Rgb Led Spotlight,Led Video Curtain Lighting,Dimming Led Downlight, Led Spotlight Shen zhen SH LED Technology Co.,Ltd , http://www.pixellightsolution.com