noun Date: 1827 a metallic gray to black mineral MnO(OH) that is a hydroxide and minor ore of manganese, any of various unstable salts made by reaction of manganese dioxide with a base
MANGANITE
Meaning of MANGANITE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012