Bible Dictionaries
Biotite
Webster's Dictionary
(n.) Mica containing iron and magnesia, generally of a black or dark green color; - a common constituent of crystalline rocks. See Mica.
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Bibliography Information
Webster, Noah. Entry for 'Biotite'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/b/biotite.html. 1828.