Psilomelane

[sai'lɔmilein]

(noun.) a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese.

班森编辑--From WordNet

(n.) A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.

伊莱扎录入