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エチオピア

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A diagram of an opal's molecular structure, showing small lilac spheres packed in misaligned sheets on top of each other. The legend shows that one sphere has a diameter of 150–300 nanometres.

オパールの神秘虹色の輝きを生む構造と世界的な産地

オパール貴オパール遊色効果シリカ