Usage History of 'pyromorphite'

The following chart shows how frequently 'pyromorphite' appeared in printed materials over time. For example, the word 'pyromorphite' occurred 8 times in books in 1823 and 470 times in 2008. From 1823 to 2008, the word 'pyromorphite' was used a total of 16,208 times in books scanned by Google. See Reference: Google Ngram project.

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