Dating zircon grains in 1986 congress passed legislation mandating
Zircon forms in silicate melts with large proportions of high field strength incompatible elements.For example, hafnium is almost always present in quantities ranging from 1 to 4%.The crystal structure of zircon is tetragonal crystal system.The natural color of zircon varies between colorless, yellow-golden, red, brown, blue, and green.Zircon is also very resistant to heat and corrosion.Because of their uranium and thorium content, some zircons undergo metamictization.
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Color in this red or pink series is annealed in geological conditions above the temperature about 350 °C.), one of the most refractory materials known.
Other applications include use in refractories and foundry casting and a growing array of specialty applications as zirconia and zirconium chemicals, including in nuclear fuel rods, catalytic fuel converters and in water and air purification systems.
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