Zircon - Geoscience Australia
Zircon sand. Source: Geoscience Australia ... The zircon is dried, graded and sized, and sometimes ground in mills before it is transported. Most natural gem-quality zircons are yellow, red, or brown. Heating and irradiation can be used to produce colourless, blue, green, and many other zircon colours. Blue is the most popular zircon gem colour.
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