Chalcedony, also known as Australian jade, is a cryptocrystalline quartz crystallite aggregate with a yellow-green-green color, similar to jadeite. The green chalcedony is a weathered leaching deposit. The shape of the original stone is irregular block, which is very different from the jade original stone, but it may be confused on the finished product.
Because its color and appearance are very similar to jade, there are unscrupulous merchants who often use it to pretend to be jade. It is called "the four killers of jade" by people in the industry. For example, Australian jade is very green and green jade. In appearance, it is very easy for outsiders to confuse them. The difference between chalcedony and jade is not difficult, as long as you master the following methods.
First, distinguish from a visual perspective
1, gloss:
Both jade and chalcedony are glassy, ​​but the emerald's luster is relatively fresh and translucent compared to chalcedony.
2, green and color root:
The chalcedony can't see the green and the radix, and the jade can be seen.
3. Green form:
The green and white boundaries of the emerald are obvious, and the head of the green part is very good. The green and white boundaries of chalcedony are not obvious, and the transparency of the green part is no different from other places. The color of chalcedony is uniform and basically does not vary in depth.
4. Internal structure:
When you look at the light, you can see that the interior of the jade is a fiber-interwoven structure, but the chalcedony is a granular structure. Chalcedony is not green, invisible crystal spots (Emerald fly wings).
Second, distinguish from the perspective of touch
The density of jadeite is 3.33g/cm3, while the density of jadeite is 1.55g/cm3, and the density of jadeite is greater than that of chalcedony. Therefore, measuring the jade by hand will have a feeling of pressing hands, on the contrary, the chalcedony will be very light.
Third, from the perspective of hearing
The two chalcedony will collide with each other and will make a dull sound. When you use two emeralds to collide lightly, it will make a crisp and long sound. The price of chalcedony is relatively cheap, because the global reserves of quartz jade are huge, and the collection value of chalcedony cannot be compared with jade. The price of thousands of Australian jade is quite good, the price of chalcedony is tens to hundreds of dollars, and the price is relatively low. Therefore, when buying jade, you must be careful not to be fooled by chalcedony.
Fourth, distinguish from physical properties
The relative density of green chalcedony is about 2.6, which is much smaller than jadeite, but small pieces are not easy to distinguish by hand. It must be determined by measurement.
The refractive index of the green chalcedony is about 1.54, which is smaller than that of jade. At the same time, the green chalcedony lacks the characteristic of visible light absorption spectrum and has no absorption line of Cr.
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