Psilomelane

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]



From WordNet (r) 2.0 [wn]:

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