Definition of "black manganese" []

• The black oxide of manganese, MnO2. (adjective)
• (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)

• "Ayla reached for her amulet and felt for the fifth object she carried in it now: a piece of black manganese dioxide nestled in the small pouch along with the three nodules of iron pyrite stuck together, a red-stained oval of mammoth ivory, the fossil cast of a gastropod, and a chunk of red ochre."