In trade, it is not conducive to customers to divide varieties by zircon structural types, which are basically high-type zircon, especially processed stones, and it is unnecessary to emphasize their types. Therefore, in today's business, varieties are still divided by color.
(1) Colorless zircon: It should be as colorless and transparent as diamonds, without any gray or earthy tones. (2) Blue zircon: the most popular variety, including natural stone and heat-treated optimized stone. Because no other substances were added in the optimization process, the optimized stone is still considered as a natural gem in jewelry appraisal, and the chromaticity of the gem is deep and shallow. Blue zircon without any brown hue has strong dichroism; Earthy tones may turn golden yellow under the action of extreme high temperature and high pressure (very rare, almost never happens). Blue zircon usually has a very light green tone. (3) blue-green or yellowish and brownish-blue zircon. (4) Green and yellow-green zircon. (5) orange, brown and yellow zircon. (6) Red zircon: including red to orange red. Some people also listed the rare zircon cat's eye as a variety.
Theoretical chemical composition Theoretical chemical composition (%): ZrO 267.22%, SiO232.78%. Sometimes it contains mixed substances, such as MnO, CaO, MgO, Fe2O3, Al2O3, TR2O3, ThO2, U3O8, TiO2, P2O5, Nb2O5, Ta2O5 and H2O. The contents of impurities such as H2O, TR2O3, U3O8, (Nb, Ta)2O5, P2O5 and HfO2 are relatively high, but when the contents of ZrO and SiO2 are relatively low, their physical properties also change, and their hardness and specific gravity decrease. Zircon is generally weak in radioactivity, and some zircon is amorphous due to strong radioactivity, such as U and Th. The hardness of this zircon can be reduced to 6 and the specific gravity can be reduced to 3.8. Therefore, many varieties are formed: Shankoushi, TR2O3 10.93%, P2O517.7%; Dashanshi, TR2O35.3%, P2O57.6%; Miaomushi, TR2O39. 12%, (Nb, Ta)2O57.69%, with high contents of U and th; Cyrtolite with high contents of TR2O3 and U3O8 is named after the crystal plane bending. Hydrated zircon containing H2O2 ~10%; Beryllium zircon, BeO 14.37%, HFO 26.0%; Hafnium-rich zircon, HfO2 can reach 24.0%. Some zircon contains uranium, thorium, etc. , and become amorphous due to strong radioactivity.
The main chemical component is zirconium silicate; The chemical composition is Zr[SiO? ], the crystal belongs to the island structure silicate mineral of tetragonal system. Crystals are short columns, usually square columns, square bipyramids or complex square bipyramids. Zircon has various colors, such as colorless, purple, golden yellow, light yellow, garnet red, olive green, champagne color, pink, purple blue, apple green and so on. And there are generally colorless, blue and red varieties. The deviation is 0.039 (high). Gloss is a strong glass luster to diamond luster. No cleavage. Mohs hardness is 6 ~ 7.5, and its specific gravity is relatively high, and its density is generally 3.90 ~ 4.73 g/cm3. High type: 4.60 ~ 4.80 g/cm3. Medium: 4. 10 ~ 4.60 g/cm3. Low type: 3.90 ~ 4g/cm3.
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