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Bible Dictionaries
Pyrolusite

Webster's Dictionary

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(n.) Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).

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