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Zircon

Gemstone
Zircon is a mineral belonging to the group of nesosilicates and is a source of the metal zirconium. Its chemical name is zirconium(IV) silicate, and its corresponding chemical formula is ZrSiO₄. Wikipedia
Colors: Blue, White, Green, and more
Chemical formula: ZrSiO₄
Hardness (Mohs hardness scale): ≥ 7.5
Refractive index: 1.93 – 1.987
Associated month: December
Luster: Adamantine
Age: 4.404 billion years

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