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Zircon
Due to its hardness, durability and chemical inertness, zircon persists in sedimentary deposits and is a common constituent of most sands.Colour Reddish brown, yellow, green, blue, gray, colorless; in thin section, colorless to pale brown. Natural green zircon is caused by natural radiation and is the most sought after by collectors.
It has a mohls hardness of 6.5-7.5 and a refractive index of 1.810-2.024 |