Distinguishing crystal mainly depends on the difference between crystal and glass. The first is about the difference between crystal and glass products. Crystal: birefringence, hardness 7, cold to the touch. Glass products: no refraction, hardness 5-6, warm to the touch. The brightness of crystal is different at every angle, and the brightness of glass is the same at every angle; Scrape the glass with crystal, there are scratches on the glass, and the traces can't be erased, and the crystal is not damaged; Scraping the crystal with glass, there are slight scratches on the crystal, but it will be erased and the glass will be damaged; In the same environment, the cold feeling of holding the crystal lasts for a long time, but holding the glass will feel warm and the heat transfer speed will be fast! Nine winning ways to distinguish true and false crystals: (so you are no longer afraid to buy fakes. . . ) 1. Look: Looking at the sun with crystal, you can see a weak or even tiny horizontal stripe or catkin-like substance. Most of the fakes are made of inferior crystal slag and glass slag, which have been polished, colored and imitated, and there is no unified substance. 2. Tongue licking: Even in hot summer, licking the surface of the crystal with your tongue will feel cold and cool; On the contrary, it is fake! 3. Illumination: When the crystal stands upright in the sun, no matter from which angle, it will release beautiful light with different brightness; On the contrary, it is fake! 4. Hardness: lightly scratch the crystal with gravel, leaving no trace; (Obsidian is less hard and must be eliminated, otherwise your obsidian will be hurt, so it's not mine, hehe) Otherwise it's fake! 5. Check with a polarizer: Turn 360 degrees under the mirror, and there will be four bright and four dark changes to be the real crystal! 6. Check with "dichroism": Rock crystals have "dichroism"! 7. Check with a magnifying glass: check with a magnifying glass of ten times under the transmitted light, and you can find the true and false bubbles! (pay special attention, if you just look at it with the naked eye, you will see that DD in your hand contains small bubbles. Hey, hey, don't buy it ) 8. Check with hair: The crystal is placed on a hair, and people can see the double shadow of the hair through the crystal! (Because of the birefringence of the crystal) On the contrary, it is false! 9. Check with a thermal conductivity meter: adjust it to 4 squares of green to test the gem, and the rock crystal will rise to 2 squares of yellow, and when it is big, it will rise to yellow. 1 lattice crystal is a very popular gem. In ancient times, it was called "water essence", that is, the essence of water, also known as "water jade", "white jade", "jade crystal" and "Millennium ice" Aristotle, a famous ancient Greek philosopher, also believed that crystals evolved from ice. In fact, crystal is the crystallization of silicon dioxide (SiO2 _ 2), which has no internal connection with water or ice. Usually colorless and transparent, but it can have different colors when it contains iron elements, such as purple, yellow, smoky gray and so on. When the crystal contains fibers or needle-like minerals arranged in a certain direction, it can be processed into "eye hunting crystal" or "starlight crystal" or "hair crystal", and if it contains water inclusions, it may become "water gallbladder crystal". Crystal and glass are very similar in appearance, but they are two completely different substances. The main differences are as follows: 1. Crystals with different materials are silicon dioxide crystals, while glass is only a mixture containing silicon dioxide in the molten state. Two. Glass with different functions only has decorative function, while crystal has piezoelectric effect in addition to decorative function and has special health care function. Three. The unit price of crystals with different prices is several times or even dozens of times higher than that of glass. Four. Different physical properties 1. Crystal has a high hardness (Mohs 7), while glass has a low hardness (Mohs 5.5). Crystals can draw marks on glass, but not vice versa. 2。 Crystal is a kind of crystal with good thermal conductivity, and it will feel cold when touched with the tip of the tongue. The glass looks warm. 3。 With a polarizer, crystal can transmit light, but glass can't. According to the different physical properties of crystal and glass, we can distinguish them conveniently. Five. Glass with different processing techniques can be hot-cast, which saves materials and labor and has low cost. Crystal is a crystal, which is irreversible after heating and melting, so it can't be molded by hot casting, but only by cold working methods such as cutting and grinding. Waste of materials and manpower, high cost. Crystal has high hardness and is not easy to wear. Glass has low hardness and is easy to scratch. The crystal has good stability and will not change color after long-term use. And glass turns yellow easily. Crystal is an optically anisotropic body, while glass is an optically isotropic body. (That is to say, crystal is mesophase crystal, while glass is amorphous. ) This can be effectively distinguished by using double polarizers. Furthermore, the hardness of crystal is 7, while the hardness of glass is 5.5, so you can distinguish crystal from glass by drawing glass. Crystal will damage glass, but glass won't. However, there are few imitations of crystal and glass now, and most of them are artificial crystals pretending to be rock crystals. First of all, I want to say that online methods such as "testing temperature", "seeing touch" and "listening to sound" all require sufficient experience as a prerequisite. If you don't have enough experience, you'd better not use this unsafe method. The effective identification method is that the inclusions of synthetic crystals are single and few, only bubble inclusions.