gothite

from The Century Dictionary.

• noun Same as goethite.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust