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You are here: Index OpalA milky-white, black or coloured form of Silica, combined with variable amounts of water, usually with a characteristic internal 'play' of coloured flashes caused by light reflected from different layers within the stone. Properties Etymology --- Origin of the word Opal at Etymonline.com General Reference Opal at Wikipedia Images Google Image Search for Opal Yahoo Image Search for Opal You are here: Index |
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