Usage History of 'feldspathic'

The following chart shows how frequently 'feldspathic' appeared in printed materials over time. For example, the word 'feldspathic' occurred 2 times in books in 1806 and 2,901 times in 2008. From 1806 to 2008, the word 'feldspathic' was used a total of 130,299 times in books scanned by Google. See Reference: Google Ngram project.

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