ˈmaŋgəˌnīt noun
( -s )
Etymology: mangan- + -ite
1. : an ore of manganese MnO(OH) consisting of manganic hydroxide in brilliant steel-gray or iron-black orthorhombic crystals or massive — called also gray manganese ore
2. : any of a series of unstable salts made by reaction of manganese dioxide with a base
calcium manganite
— called also manganate(IV)