Crystal: birefringence phenomenon, hardness 7, cool to the touch.
Glass products: no birefringence phenomenon, hardness 5 - 6, warm to the touch.
Crystal brightness at every angle is not the same, glass brightness at every angle is the same; with crystal scratch glass, glass scratches, traces of rubbing does not go, while the crystal is not damaged; with glass scratch crystal, crystal on the slight scratches, but rubbing that is to go, while the glass is damaged; in the same environment, the hand of crystal cool feeling persistent, but the hand of the glass will feel warm and heat transfer speed!
Identify the real crystal of the nine must-win method: (so that you are no longer afraid of buying a fake...).
1. eye: hold the crystal to the sun observation, you can see a faint are small horizontal lines or willow-like material. Fake more than the use of defective crystal slag, glass slag melting, after grinding processing, coloring imitation and become, there is no uniform substance.
2. Tongue: even in the hot summer, with the tongue lick the surface of the crystal, there is a cold and cool feeling; the opposite is false Oh!
3. Light: the crystal will be placed vertically in the sunlight, no matter from which angle, will release a beautiful luster, brightness is different; vice versa for the fake!
4. Hardness: with gravel in the crystal gently scratch, will not leave traces; (obsidian hardness smaller, must be excepted, otherwise your obsidian is injured, so that is not my, huh) vice versa is fake!
5. Check with a polarizer: turn 360 degrees under the mirror, there are four bright and four dark changes for the real crystal!
6. Check with the "dichroic": natural crystals have "dichroic"!
7. Check with a magnifying glass: with ten times magnification in the transmitted light check, can find the bubble of its original for false! (Special attention, if you just simply with the naked eye observation, you see your hands inside the DD contains small bubbles, hey, advise you never buy oh!)
8. Check with a hairline: crystal put on a hairline, people can see through the crystal hairline double shadow! (Because the crystal of the birefringence) and vice versa is false!
9. Check with a thermal conductivity meter: it will be adjusted to the green 4 grid test stones, natural crystals rise to yellow 2 grid, the area is large when rising to yellow 1 grid
Crystals are a kind of popular gemstones, in ancient times, known as the "water essence", that is, the essence of the water, which is also referred to as Bodhisattva stone", "light-emitting stone" and so on. The famous ancient Greek philosopher Aristotle also believes that the crystal is gradually evolved from ice. In fact, crystal is silicon dioxide (SiO2) crystals, and water or ice has no intrinsic connection. It is usually colorless and transparent, but when it contains iron group elements, it can have different colors, such as purple dispute, yellow, smoky grey and so on. When the crystal contains fibers or needle minerals arranged in a certain direction, it can be processed into "crystal hunting eye" or "star crystal" or "hair crystal", if it contains inclusions of water, that is If it contains water inclusions, it may become "water gall bladder crystal".
Crystal and glass look very similar, but are two completely different substances. The main difference is the following five aspects:
One. Different materials
Crystal is a crystalline silicon dioxide, while glass is just a mixture of molten state containing silicon dioxide.
Two. Efficacy of different
Glass is only decorative, and crystal in addition to the decorative effect, there is a piezoelectric effect, there are special health effects.
Three. Different prices
Crystal unit price is several times higher than glass or even dozens of times.
Four. Physical properties are different
1. crystal is crystalline, with high hardness (Mohs 7), while the hardness of glass is lower, (Mohs 5.5), crystal can be scratched on the glass, and vice versa can not.
2. Crystal is crystalline, thermal conductivity is better, with the tip of the tongue lick touch a cold feeling. Glass, on the other hand, appears warm.
3. Distinguished by polarizing glasses, crystal transmits light, while glass does not.
We can easily distinguish between crystal and glass on the basis of their different physical properties.
Five. Processing process is different
Glass can be hot cast into shape, save material and labor cost is low.
Crystal is crystalline, heated and melted can not be reversed, so you can not use the hot casting molding method, can only be used to cut and grind and other cold processing method. Costly material and labor, high cost.
Crystal hardness, not easy to wear. Glass hardness is low, easy to rub hair.
Crystal stability, long use will not change color. Glass is easy to turn yellow.
Crystal is light non-homogeneous body, and glass is light homogeneous body. (That is to say, crystal is an intermediate crystal group crystals, while the glass is amorphous)
This point, through the use of double polarized lenses can be crystal and glass can be effectively distinguished.
Additionally, crystal has a hardness of 7, while glass has a hardness of 5.5, so by scratching the glass, you can distinguish between crystal and glass. (Crystal can cause damage to the glass, and glass can not cause damage to the glass)
But, now there are few glass imitation crystal, mostly synthetic crystals in the pretense of natural crystal.
First of all, I would like to say, those online "test temperature", "feel", "listen to the sound" and other methods are required to have enough experience as a prerequisite, if you do not have enough experience, it is best not to use this kind of unsecured method.
The effective way to differentiate between the two is to look at the inclusion
Synthetic crystals have a single and small number of clusters, only bubble clusters. Natural crystals have more inclusions, in addition to gas inclusions, there are solids (mostly powders), and a few can also see the liquid (water gall bladder crystals).
In addition, synthetic crystals can also be seen in the elongated nucleus, while the natural crystal is not.
Now there is a synthetic hair crystal, synthetic hair crystals and natural hair crystals, the difference between the synthetic hair crystal and natural hair crystals is: synthetic hair crystals "hair" in the same direction, natural hair crystals "hair" in the direction of the messy.