What is "manganate"

Manganate \Man"ga*nate\, n. [Cf. F. manganate.] (Chem.) A salt of manganic acid.

Note: The manganates are usually green, and are well-known compounds, though derived from a hypothetical acid.

n. (context chemistry English) Any compound containing the manganate ion, MnO₄^2-.

n. a salt of manganic acid containing manganese as its anion

In inorganic nomenclature, a manganate is any negatively charged molecular entity with manganese as the central atom. However, the name is usually used to refer to the tetraoxidomanganate(2−) anion, MnO, also known as manganate(VI) because it contains manganese in the +6 oxidation state. Manganates are the only known manganese(VI) compounds.