Zircon is a silicate mineral, which is the main ore for refining zirconium metal, and contains impurities such as Hf, Th, U and TR. Zircon widely exists in acidic igneous rocks, metamorphic rocks and other sediments.

The chemical properties of zircon are very stable, so gem-grade zircon can also be seen in river gravel. There are many kinds of zircon, and different zircon will have different colors, such as black, white, orange, brown, green or colorless and transparent. Gem-grade zircon is cut like a diamond.

Extended data:

Information about zircon:

1, colorless to light yellow, strong dispersibility and large refractive index. No = 1.9 1~ 1.96，Ne = 1.957~2.04。 The refractive index of isotropic body will decrease, N = 1.60~ 1.83.

2. The linear thermal expansion coefficient is 5.010-6/℃ (200 ~1000℃), which has good thermal shock resistance and stability. It does not react with CaO, SiO2 _ 2, C and Al _ 2O _ 3 at high temperature, and has strong slag corrosion resistance and does not stick to steel.

3. Zircon is extremely resistant to high temperature, with a melting point of 2750. And is resistant to acid corrosion. 80% of zircon in the world is directly used in foundry industry, ceramics, glass industry and manufacturing refractories. A small amount of zircon is used in ferroalloy, medicine, paint, leather making, abrasive, chemical industry and nuclear industry. A very small amount of zircon is used to smelt zirconium.

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