limonite
/ˈlaɪmənaɪt/- noun nounmass noun an amorphous brownish secondary mineral consisting of a mixture of hydrous ferric oxides, important as an iron ore褐铁矿（褐色非结晶次生矿物, 由水合氧化铁的混合物组成, 是重要的铁矿石）。
派生词
limonitic
adjective词源
early 19th cent.: from German Limonit, probably from Greek leimōn 'meadow' （suggested by the earlier German name Wiesenerz, literally 'meadow ore'）.