Usage History of 'opaline'

The following chart shows how frequently 'opaline' appeared in printed materials over time. For example, the word 'opaline' occurred 4 times in books in 1771 and 2,917 times in 2008. From 1771 to 2008, the word 'opaline' was used a total of 79,169 times in books scanned by Google. See Reference: Google Ngram project.

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