Usage History of 'variolite'

The following chart shows how frequently 'variolite' appeared in printed materials over time. For example, the word 'variolite' occurred 6 times in books in 1784 and 57 times in 2008. From 1784 to 2008, the word 'variolite' was used a total of 2,161 times in books scanned by Google. See Reference: Google Ngram project.

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