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Zircon

An important source of zirconium, hafnium and thorium. Quality-grade crystals are cut into genstones with green zircons being much in demand. Usually associated with acidic, igneous rocks or pegmatites. The crystals are four-sided and stubby, often perfectly transparent with good luster, but they can also be opaque and dull.

Crystal structure: Tetragonal.

Color : Colorless to yellow.