pyrolusite
/ˌpaɪrəˈluːsaɪt/
noun
- A black or dark gray mineral that is the main source of manganese, used in making steel and batteries.
- The steel industry relies on pyrolusite to add strength and hardness to metal alloys.
- Pyrolusite is often found in deposits alongside other manganese ores.
- Miners extracted pyrolusite from the old mine to supply battery manufacturers.