September 16, 2017

Agate 天然石-メノウ

English Name: Agate

German: Achat

Japanese:メノウ

French: Agate

Spanish: Ágata

Chemical Formula: SiO2 silicon dioxide (kind of Quartz)

Crystal system: Rhombohedral Microcrystalline

Hardness: 6.5–7

Luster: Waxy

Refractive index: 1.530–1.540 (Bi-refringence up to 0.004)...

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