Opal

Opal is a hydrated form of silica known for its unique play of color. Precious opals display a phenomenon called opalescence, caused by the diffraction of light.

5 specimens in this category

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Fake Opal

Fire Opal

Hardness: 5.5 - 6.5

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Moss Opal

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Olive Opal

Hardness: 5.5 - 6

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Pink Opal

Hardness: 6

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