manganite

/mang-guh-nahyt/US // ˈmæŋ gəˌnaɪt //UK // (ˈmæŋɡəˌnaɪt) //

锰矿,锰酸盐,锰铁矿,芒硝

Definitions

n.名词 noun

1
- : a gray to black mineral, hydrous manganese oxide, MnO; gray manganese ore.
- : Chemistry. any of a series of salts containing tetravalent manganese and derived from either of two acids, H4MnO4 or H2MnO3.

Manganite, or hydroxide of manganese; is brownish-black or iron-black, powder brown, with somewhat of a metallic lustre.
The hydrated form, found native as the mineral manganite, is produced by the spontaneous oxidation of manganous hydroxide.
The sesquioxide is found crystallized in an anhydrous form in braunite, and hydrated in manganite.
The hydrate occurs sometimes in nature as black crystals (manganite).
It is a grey stone, full of crystalline needles, like manganite.