manganite

名词 manganite:

1. a black mineral consisting of basic manganese oxide; a source of manganese

man.ga.nite

n.（名词）
A steel-gray to black mineral, MnO(OH), found in North America and Europe; manganese oxide.
水锰矿：一种钢灰至黑色的矿物，MnO(OH)，产于北美和欧洲；氧化锰