goe·thite /ˈgʌ(r)ˌtaɪt/
  針鐵礦
  Gö·thite, go·thite, or Goe·thite, n.  Min. A hydrous oxide of iron (HFeO2), occurring in prismatic crystals, also massive, with a fibrous, reniform, or stalactitic structure. The color varies from yellowish to blackish brown.
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  goethite
       n : a red or yellow or brown mineral; an oxide of iron that is a
           common constituent of rust [syn: gothite]