Usage History of 'chalcocite'

The following chart shows how frequently 'chalcocite' appeared in printed materials over time. For example, the word 'chalcocite' occurred 6 times in books in 1864 and 1,306 times in 2008. From 1864 to 2008, the word 'chalcocite' was used a total of 100,042 times in books scanned by Google. See Reference: Google Ngram project.

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