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Atomic Positional Parameters
Fe 4c  0.145  0.250 -0.045
H  4c -0.080  0.250 -0.380
O1 4c -0.199  0.250  0.288
O2 4c -0.053  0.250 -0.198

Reference
A Szytula, A Burewicz , Z Dimitrijewic, S Krasnicki, H Rzany, J Todorovic, A Wanic, and W Wolski
Physica Status Solidi (1968) 26, 429

Mineral Chemistry
Goethite is one of the most widespread of minerals, forming as a weathering product of iron-containing minerals. It is the principal constituent of limonite - a general term for hydrous iron oxides occurring in bogs or swamps. The oxidised 'gossan' caps of sulphide mineral veins contain goethite. Goethite is also found as an inorganic or biogenic precipitate from marine or meteoric waters, and in laterites formed by weathering in tropical climates.

This mineral is a member of the diaspore group, which includes diaspore, a-AlO(OH), groutite, a-MnO(OH), montroseite, (V,Fe)O(OH), and bracewellite, CrO(OH). A hexagonal close packed arrangement is found if O^2- and OH^- are taken together; Fe³⁺ ions in goethite are located in octahedral sites inbetween.

Polymorphs of FeO(OH) are the minerals akaganeite, feroxyhyte and lepidocrocite.

The CHIME figure shows irons as ochre spheres, oxygens as red spheres, and hydrogens as white spheres. The unit cell is outlined.