psilomelane

Noun
  1. A mineral consisting of hydrated basic oxide of manganese and barium;
    A source of manganese (synset 114716503)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    substance holonym: atomic number 25, manganese, mn - a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals

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