Limonite together with
hematite are
mined as
ore for the production of
iron. Limonite heavy and yellowish-brown. It is not a true mineral, however, but a mixture of similar
hydrated iron
oxide minerals, mostly
Goethite. Limonite forms mostly in or near oxidized iron and other metal ore deposits and as
sedimentary beds. Limonite has been known to pseudomorph other minerals such as
pyrite, meaning it replaces a crystal of pyrite with limonite but keeps the shape of the pyrite crystal.
Hardness is 4 - 5.5, specific gravity is 2.9 to 4.3.
See also: List of minerals