Manganese Silvery Grey Coloured Metal
Manganese is a chemical element found in many minerals usually those combined with iron. A hard but very brittle silvery grey coloured metal it's essential for the production of iron and steel. When exposed to air it tarnishes slowly and with exposure to moisture it rusts. When used as an alloy in aluminium manganese reduces corrosion.
Manganese compounds were used by glass makers in Ancient Greece and Rome to either add or remove colour from glass. Cave paintings in France believed to be 30,000 to 24,000 years old also contain pigments of manganese.