Found 2 items, similar to psilomelane.
English → English (WordNet) Definition: psilomelane psilomelane n : a mineral consisting of hydrated basic oxide of manganese and barium; a source of manganese
English → English (gcide) Definition: Psilomelane Psilomelane \Psi*lom"e*lane\, n. [Gr. ? bare + ?, ?, black.] (Min.) A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color. [1913 Webster]