noun Mineralogy.
an amorphous hydrated ferric oxide, varying in color from dark brown to yellow, used as an ore of iron.

1815–25; < Greek leimṓn meadow + -ite1

limonitic [lahy-muh-nit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
limonite (ˈlaɪməˌnaɪt)
a common brown, black, or yellow amorphous secondary mineral that consists of hydrated ferric oxides and is a source of iron. Formula: FeO(OH).nH2O
[C19: probably from Greek leimōn, translation of earlier German name, Wiesenerz meadow ore]

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Example sentences
The rock cleaves along finely laminated bedding planes which are coated with
Occasionally, large pseudomorphs of limonite after pyrite can be found in these
  areas as well.
On this image, white and yellow colors indicate rocks rich in clay minerals and
  limonite in rocks of red and yellow hues.
Much of the material was spiderwebbed with thin veinlets of limonite.
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