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zircon


zircon crystals
Zircon crystals. Credit: NSF
A hard silicate mineral (ZrSiO4), a major ore of zirconium of widepsread occurrence. Zircon forms prismatic crystals in the tetragonal system, which when transparent are used as gems. They may be colorless, red, orange, yellow, green, or blue, and have a high refractive index.


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