Manganese oxide refers to a compound made up of the element manganese and oxygen. It is a type of chemical that is commonly used as a catalyst in chemical reactions or as a pigment in paints and ceramics. Full definition
Suspicions that Mars once had oxygen - rich air are backed by the NASA Curiosity rover's find of manganese oxide in surface rocks (newscientist.com)
The creation of manganese oxide requires even more oxygen than Mars's iron soil rusting, along with flowing water. (sciencemag.org)
In most non-industrial devices used in relatively safe conditions, you have lithium manganese oxide flowing into graphite, because those materials are cheap, relatively safe, and dense. (fortune.com)