Bible Dictionaries
Manganite

Webster's Dictionary

(1):

(n.) One of the oxides of manganese; - called also gray manganese ore. It occurs in brilliant steel-gray or iron-black crystals, also massive.

(2):

(n.) A compound of manganese dioxide with a metallic oxide; so called as though derived from the hypothetical manganous acid.

Bibliography Information
Webster, Noah. Entry for 'Manganite'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​m/manganite.html. 1828.