LIMONITE
limonite
(noun) a widely occurring iron oxide ore; a mixture of goethite and hematite and lepidocrocite
Source: WordNet® 3.1
Noun
limonite (countable and uncountable, plural limonites)
(mineral) any of several natural hydrous iron oxides; often a mixture of goethite and hemite with clays and manganese oxide
Source: Wiktionary
Li"mon*ite, n. Etym: [Gr. limonite, G. limonit.] (Min.)
Definition: Hydrous sesquixoide of iron, an important ore of iron,
occurring in stalactitic, mammillary, or earthy forms, of a dark
brown color, yellowish brown powder. It includes bog iron. Also
called brown hematite.
Source: Webster’s Unabridged Dictionary 1913 Edition