First, it is about the distinction between crystal and glass products.
Crystal: a birefringence, hardness 7, feel cool.
Glass products: no birefringence phenomenon, hardness 5 - 6, feel warm.
Crystal every angle of the brightness are not the same, the brightness of each angle of the glass are the same; with crystal glass, glass scratches, traces of wiping, while the crystal is not damaged; with glass crystal, crystal There is a slight scratch, but rub that is, while the glass damage; the same environment, holding the crystal cold feeling lasting, but holding the glass will feel warm, and the heat transfer speed!
Identify the true and false crystal nine will win: (so no longer afraid to buy fake ...)
1. See: holding the crystal facing the sun observation, you can see a touch of small stripes or catkins-like material. Fake more use of residual crystal slag, glass slag smelting, after grinding processing, coloring made of imitation, there is no uniform material.
2. tongue licking: even in the hot summer, with the tongue licking the surface of the crystal, there is cold and cool feeling; the contrary is false Oh!
3. Light: the crystal erected in the sun, no matter from which angle, will release the beautiful luster, brightness is different; the other is fake!
4. Hardness: with gravel in the crystal gently strokes, will not leave traces; (obsidian hardness smaller, must be excluded, or your obsidian to hurt, so that is not my, huh, huh) is fake The
5. Check with a polarizer: 360 degrees in the mirror, there are four changes in the dark crystal for the real!
6. with "two color" check: natural crystal "two color"!
7. Check with a magnifying glass: Ten times magnifying glass in the transmission of light under the inspection, can find the bubble of its own leave! (With particular attention, if you are simply with the naked eye to see you in the hands of DD containing small bubbles, hey, advised you do not buy Oh!)
8. Check with the hair: crystal placed on a hair, people can see through the crystal hair twilight! (Because of the birefringence of the crystal) is counterfeit!
9. Check with a thermal conductivity meter: adjust it to the green 4 grid test gem, natural crystal rose to yellow 2 grid, when the area rose to yellow 1 grid
Crystal is a quite popular gem, in ancient times, called "water essence", that is, the essence of water, which also called "water jade", "white attached", "jade", "Millennium ice "," Buddha stone "," light stone "and so on. Ancient Greek famous philosopher Aristotle also believes that the crystal is gradually evolved from the ice. In fact, the crystal is silica (SiO2) crystal, and water or ice is not inherent. It is usually colorless and transparent, but iron-containing elements can have different colors, such as purple, yellow, smoke gray and so on. When the crystal contains a certain direction of the fiber or needle-like minerals, can be processed into a "crystal hunting eye" or "star crystal" or "hair crystal", if the water inclusions, it may become "water gall bladder crystal".
Crystal and glass look very similar, but it is two completely different substances. The main difference is the following five aspects:
one. Material is different
The crystal is a crystalline silica and the glass is only a mixture of melts containing silica.
two. Different efficacy
Glass is only decorative effect, and crystal in addition to decorative role, there are piezoelectric effect, a special health effects.
three. The price is different
Crystal unit price than glass several times or even several times.
four. Physical properties are different
1. Crystal is crystal, with a high hardness (Mohs 7), while the glass hardness is low, (Mohs 5.5), crystal can be drawn on the glass traces, and vice versa can not.
2. Crystal is crystal, thermal conductivity is better, with a tongue licking touch cold feeling. While the glass is warm.
3. With polarizers, crystal can light, and glass can not.
We can easily distinguish them from the different physical properties of the crystal and the glass.
Fives. Processing technology is different
Glass can be hot cast molding, cost savings and low cost.
Crystal is a crystal, can not be reversed after heating, so you can not use hot casting method, can only use cutting and other cold processing. Faster, high cost.
Crystal hardness is high, easy to wear. Glass is low in hardness and easy to wipe.
Crystal stability is good, long-term use will not change color. While the glass is easy to turn yellow.
Crystal is a light nonhomogeneous body, and glass is a light homogeneous body (that is, crystal is intermediate crystal crystal, and glass is amorphous)
This can be done by using a double polarizer to distinguish the crystal from the glass effectively.
In addition, the hardness of the crystal is 7, and the hardness of the glass is 5.5, and the glass and the glass can be distinguished by carving the glass (the crystal can cause damage to the glass and the glass can not cause damage to the glass)
However, now has little use of glass imitation of the crystal, and most are synthetic crystal in the impersonation of natural crystal.
First of all, I would like to say that online "try to temperature", "feel", "listen to the sound" and other methods need to have enough experience as a prerequisite, if not enough experience, it is best not to use this non-insurance approach.
The effective way to distinguish is to see the body
Synthetic crystal body of a single and the number of small, only the bubble body, while the natural crystal in the body more, in addition to gas body, there are solid (mostly powder), a few can see the liquid (water Bile crystal).
In addition, synthetic crystal can also see the slender nucleus, and natural crystal is not.
Now there is a synthetic crystal, synthetic crystal and natural crystal of the difference is: synthetic crystal "hair" in the same direction, natural crystal "hair" direction messy.