Bible Dictionaries
Fergusonite
Webster's Dictionary
(n.) A mineral of a brownish black color, essentially a tantalo-niobate of yttrium, erbium, and cerium; - so called after Robert Ferguson.
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Bibliography Information
Webster, Noah. Entry for 'Fergusonite'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/f/fergusonite.html. 1828.