What is a mineral of a blackish green color, commonly massive or in nodules. It is a hydrous phosphate of iron called?
dufrenite — A mineral of a blackish green color, commonly massive or in nodules. It is a hydrous phosphate of iron. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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