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1 Iron oxides

• Iron (II) oxide or ferrous oxide (FeO) The black- coloured powder in particular can cause explosions as it readily ignites.

• Iron (III) oxide or ferric oxide (Fe₂O₃) known in its natural state as hematite or haematite, but also purified for use as a coating in magnetic audio and computer media, where it is known as ferric oxide. Also known as rouge.

• Iron (II, III) oxide or ferrous ferric oxide (Fe₃O₄), better known as the black-coloured mineral magnetite or lodestoneLodestone or loadstone refers to either: Magnetite, a magnetic mineral form of Iron (II, III) oxide, one of several iron oxides. A piece of magnetized magnetite that was used as an early form of magnetic compass. Only magnetite with a particular crystalli also seen on mars

. .

2 Iron hydroxides

• Iron hydroxide FeO(OH), found as the minerals siderogel and feroxyhyte . It also has a variant known as lepidocrocite .

• Iron (II) hydroxideIron (II) hydroxide is an insoluble compound produced when iron (II) ions, from a compund such as iron (II) sulfate react with hydroxide ions. Iron (II) hydroxide itself has a greenish color. Chemical formula Fe(OH). Hydroxides. Fe(OH)₂. green colour.

• Iron (III) hydroxide Fe3+O(OH) found as the mineral goethiteGoethite is a hydrated iron oxide, HFeO or Fe3+O(OH) (known as lepidocrocite). Its hardness ranges from 5. 5 on the Mohs Scale, and its specific gravity varies from 3. It forms needle-like crystals, and is not generally considered very interesting as a mi. Red-brown colour.

• Iron (III) hydroxide Fe(OH)₃. Dark brown.

There are also several other variants.

3 See also

A number of these compounds are found in rustThis article is about the type of corrosion. For the fungus, see rust (fungus). For the person, see Mathias Rust. For the town in Austria, see Rust, Austria. Rust is the substance formed when iron compounds corrode in the presence of water and oxygen. and rusticleA Rusticle is a little similar to an icicle or stalactite in appearance, but occurs under water when wrought iron rusts. They may be familiar from underwater photographs of shipwrecks. The rusticle consists of up to 35% iron compounds including iron oxides.