资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.

资料来源 : WordNet®

psilomelane
     n : a mineral consisting of hydrated basic oxide of manganese
         and barium; a source of manganese