Dry Opal Thumbnail | Wello Mine, Ethiopia | SiO2 · nH2O | Opal Specimen

Ethiopian Opal is the form of mineral silica, and it contains 3% to 21% of water in itself. This type of opal is stable and does not need to be kept in water.
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The name comes from the Greek word opallios, meaning *to change color*, which these most certainly do with a wild color play.
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Metaphysically The ancient Greeks thought the stone could give people the gift of prophecy and protect them from disease.