It is formed by the oxidation of minerals to Fe3 ++ and a series of iron oxides formed under the condition of surface oxidation.
Calcium-aluminum garnet jade, similar to jadeite, was found and some research work was done in the detection work in 2004, but due to
There are not many in the market, which has not attracted enough attention. From the first half of 2006 to the first half of this year, a large number of this kind of jade appeared on the market.
Stones often pretend to be yellow jadeite, so we have done some supplementary research work. Now we list some basic characteristics as follows, hoping to introduce them.
Pay attention.
This jade is yellow, mainly yellowish brown, with a small amount of light green brown. Gloss is mostly glass luster and grease luster. See the unique color of jade.
The cleavage plane of the flying wing flashed. This kind of jade often has black spots inside, which is different from jadeite. We have done some routine gemological research and X.
Optical diffraction analysis and infrared spectrum analysis. This kind of jade is often associated with Fushan stone. There are both single almandine and complex in the sample.
* * * Fushan iron stone raw material sample. The difference between jade and jade is that:
1 color. Our common samples are mostly yellow, brown and brown. , grayish white. Those who have never seen green. In other words, it is mainly pretending to be jade.
Yellow jadeite appears in.
2 luster. The common luster of this jade is strong glass luster and oily luster. Grease has a strong luster, which makes jade "oily".
3 density. We measured the density of nearly 30 samples. The density varies from 3.4 1 to 3.5 1. 3.33 higher than emerald. There are obvious things to do.
A heavy feeling.
4 refractive index. The refractive index of more than 30 samples was measured (mainly point measurement and a few plane measurements). The refractive index of 1.72- 1.73 has little change, which is obvious.
The refractive index is higher than that of jadeite (1.65- 1.66).
5 spectroscopic examination. Jade usually has an absorption line of 437nm, but not in calcium-aluminum garnet.
6 infrared spectrum analysis shows that there is obvious difference between them.
For more detailed information, go and see the dead jade jewelry and famous houses in Yuli.