Goethite is an iron oxyhydroxide containing ferric iron. It is the main component of rust and bog iron ore. Goethite's hardness ranges from 5.0 to 5.5 on the Mohs Scale, and its specific gravity varies from 3.3 to 4.3. The mineral forms prismatic needle-like crystals ("needle ironstone"[3]) but is more typically massive.[2]
Feroxyhyte and lepidocrocite are both polymorphs of the iron oxyhydroxide FeO(OH) which are stable at the pressure and temperature conditions of the Earth's surface. Although they have the same chemical formula as goethite, their different crystalline structures make them distinct minerals.[5]
Additionally, goethite has several high-pressure and high-temperature polymorphs, which may be relevant to the conditions of the Earth's interior. These include ε-FeOOH, which has an orthorhombic crystal structure,[10] a cubic pyrite-type polymorph with[11] or without losing hydrogen[12] and an ultradense hexagonal structure.[13]
Goethite has the same crystal structure as diaspore, the analogous aluminium oxide-hydroxide mineral. Oxygen and hydroxide ions form a hexagonal close-packed structure, with iron ions filling octahedral sites between the anions. The sites filled by iron ions form paired chains running the length of the crystal, with the two chains in each pair joined by hydroxide ions.[14]
The goethite crystal structure viewed along [001]. Red ions are iron, white are oxygen, and yellow are hydroxide.
A microscopic picture of Goethite (name misspelled on picture)
Goethite often forms through the weathering of other iron-rich minerals, and thus is a common component of soils, concentrated in laterite soils. nanoparticulateauthigenic goethite is a common diagenetic iron oxyhydroxide in both marine and lake sediments.[15] The formation of goethite is marked by the oxidation state change of Fe2+ (ferrous) to Fe3+ (ferric), which allows for goethite to exist at surface conditions. Because of this oxidation state change, goethite is commonly seen as a pseudomorph. As iron-bearing minerals are brought to the zone of oxidation within the soil, the iron turns from iron(II) to iron(III), while the original shape of the parent mineral is retained. Common goethite pseudomorphs include pyrite, siderite, and marcasite, though any iron(II)-bearing mineral could become a goethite pseudomorph if proper conditions are met. It may also be precipitated by groundwater or in other sedimentary conditions, or form as a primary mineral in hydrothermal deposits. Goethite has also been found to be produced by the excretion processes of certain bacteria types.[16]
Goethite is found all over the planet, usually in the form of concretions, stalactitic formations, oolites (a form consisting of tiny round grains cemented together),[4] reniform (kidney shapes) or botryoidal (globular, like bunches of grapes) accumulations. It is also a very common pseudomorph. It is frequently encountered in the swampy areas at the head of spring waters ('bog iron'), on cave floors, and on the bottom of lakes and small creeks. The boxworksorgossan resulting from the oxidation of sulfide ore deposits is formed of goethite along with other iron oxides and quartz.[17][2]
Deposits significant in location, if not in abundance, have been found in the Martian crater Gusev by NASA's Spirit rover, providing strong evidence for the presence of liquid water on the planet in an earlier stage of its evolution.[18]
Its main modern use is as an iron ore, being referred to as brown iron ore.[4] Goethite is an important component of ochre pigments,[21] and has been heat-treated for use as a red pigment since Paleolithic times.[22] Iron-rich lateritic soils that have developed over serpentinite rocks in tropical climates are mined for their iron content, as well as other metals.[23]
Fine goethite specimens are rare and therefore are valued collectibles.[17] Banded or iridescent varieties are cut and polished into cabochons for jewelry making.[24]
In a royal tomb of the ancient kingdom of Phrygia, a body was found believed to be King Gordias, father of the legendary King Midas. The burial shroud had been colored with a dye containing goethite, which in its original unfaded state would have made the shroud look like it was woven from gold. Historians speculate that the legend of King Midas' golden touch might have originated from Phrygian royalty wearing clothes made from such golden-colored textiles.[25][26]
^ abAnthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (2005). "Goethite"(PDF). Handbook of Mineralogy. Mineral Data Publishing. Archived(PDF) from the original on 2022-10-09. Retrieved 14 March 2022.
^Larese-Casanova, Philip; Haderlein, Stefan B.; Kappler, Andreas (2010). "Biomineralization of lepidocrocite and goethite by nitrate-reducing Fe(II)-oxidizing bacteria: Effect of pH, bicarbonate, phosphate, and humic acids". Geochimica et Cosmochimica Acta. 74 (13): 3721–34. Bibcode:2010GeCoA..74.3721L. doi:10.1016/j.gca.2010.03.037.
^ abcSinkankas, John (1964). Mineralogy for amateurs. Princeton, N.J.: Van Nostrand. pp. 342–344. ISBN0442276249.
^Hradil, David; Grygar, Tomáš; Hradilová, Janka; Bezdička, Petr (April 2003). "Clay and iron oxide pigments in the history of painting". Applied Clay Science. 22 (5): 223–236. Bibcode:2003ApCS...22..223H. doi:10.1016/S0169-1317(03)00076-0.
^Cavallo, G.; Fontana, F.; Gialanella, S.; Gonzato, F.; Riccardi, M. P.; Zorzin, R.; Peresani, M. (October 2018). "Heat Treatment of Mineral Pigment During the Upper Palaeolithic in North-East Italy: Heat treatment of mineral pigment during the Upper Palaeolithic". Archaeometry. 60 (5): 1045–1061. doi:10.1111/arcm.12360.
![The goethite crystal structure viewed along [001]. Red ions are iron, white are oxygen, and yellow are hydroxide.](http://en.wikipedia.org/wiki/File:Goethite_c.png)
![The goethite crystal structure viewed along [010]](http://en.wikipedia.org/wiki/File:Goethite_b.png)
