Fushan Stone is a relatively common silicate mineral, which is a glass-like crystal of yellow, green, gray or brown color. It is green because it contains chromium. It is brown or pink because it contains titanium and manganese. It is blue because it contains copper and so on. Or good quality Fushan stone can be processed as a gemstone.
1. The refractive index of Fushan Stone is obviously larger than that of jade. According to the point method, Fushan Stone is 1.71, while jadeite is generally 1.66. It is difficult to see the grain boundary of the magnifying stone. It is not easy to see the intertwined structure of the granular fiber unique to the jade. Under the beam splitter, the 465 nm absorption band can be clearly seen, while the jadeite is visible at 437 nm.
2. The infrared spectrum of Fushan Stone and Jadeite is very different, and there are significant differences in the number and shape of the bands and the wavenumber characteristics of the absorption bands (Table 3). In particular, there is no light base in the chemical composition of jadeite (Jadeite), so there is no absorption band in the high frequency region 3400-3800cm-', and Fushan stone has a strong absorption band in this range because it contains light base. This is the key to distinguishing Fushan Stone and Emerald.
Identification judgment suggestion: Fushan stone's ochre seems to be self-color, original color, color is more uniform, the bottom is generally thin, and the jade color is secondary color, the color is uneven in most cases, the color along the crack Or intergranular gap distribution, and the bottom is generally thicker, usually with graininess. If a piece of yellow enamel is very uniform and the bottom is very delicate, then the possibility of jade is very small.
Fushan Stone, after all, is not jade, although their shapes are somewhat similar, density and hardness are similar, as long as they are carefully identified, there is still a big difference in refractive index and internal structural characteristics. The infrared and X-ray diffraction patterns of Fushan Stone and Jadeite are also very different.
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