Mineral: Zircon; Chemistry: ZrSiO 4; Color: Blue, red, yellow, orange, brown, green; Refractive index: High: 1.925 to 1.984 (+/- 0.040) Medium: 1.875 to 1.905 (+/- 0.030) Low: 1.810 to 1.815 (+/-0.030) Birefringence: 0.000 to 0.059 (low …
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