Limonite

Formula: FeO(OH)·nH2O

Colour: Light brown to brown, may be yellowish-brown

Lustre: Earthy

Hardness: 4 – 5½

Specific Gravity: 2.7 – 4.3

Name: Named in 1813 by Johann Friedrich Ludwig Hausmann from the greek λειμωυ for meadow alluding to its common occurrences in bogs.

A Mixture Of: Goethite, Hematite, Hisingerite, Jarosite, Lepidocrocite, Maghemite. Currently used for unidentified massive hydroxides and oxides of iron, with no visible crystals, and a yellow-brown streak. ‘Limonite’ is most commonly the mineral species goethite, but can also consist of varying proportions of lepidocrocite, hisingerite, pitticite, jarosite group species, maghemite, hematite, etc.