Bible Dictionaries
Psilomelane
Webster's Dictionary
(n.) A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.
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Bibliography Information
Webster, Noah. Entry for 'Psilomelane'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/psilomelane.html. 1828.