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Agate
Gemstone
Agate is the banded variety of chalcedony, which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks. Wikipedia
Hardness (Mohs hardness scale): 6.5 – 7
Luster: Vitreous
Chemical formula: SiO₂
Mohs: 6.5-7
Birefringence: up to +0.004 (B-G)
Category: Chalcedony variety
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