Manganese metal belongs to the transition group.
Manganese metal easily oxidizes turning brown its surface, and if its react with acid like hydrochloric acid turn blue due to the reaction and the production of the chloride. Manganese metal is a very common material and it is often used in alloys. Manganese metal is an important ingredient in many steels. Manganese metal can be found in nature in large quantities in many minerals. Its probably most famous compound is the strong oxidizing agent potassium permanganate. Every life form needs small amounts of manganese.