Usage History of 'tetrahedrite'

The following chart shows how frequently 'tetrahedrite' appeared in printed materials over time. For example, the word 'tetrahedrite' occurred 2 times in books in 1817 and 648 times in 2008. From 1817 to 2008, the word 'tetrahedrite' was used a total of 56,782 times in books scanned by Google. See Reference: Google Ngram project.

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