Usage History of 'iolite'

The following chart shows how frequently 'iolite' appeared in printed materials over time. For example, the word 'iolite' occurred 8 times in books in 1807 and 548 times in 2008. From 1807 to 2008, the word 'iolite' was used a total of 8,955 times in books scanned by Google. See Reference: Google Ngram project.

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