Iron oxide

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Iron oxide pigment

There are a number of iron oxides:

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 lodestone also seen on mars

. .

Iron hydroxides

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

• Iron (II) hydroxide Fe(OH)₂. green colour.

• Iron (III) hydroxide Fe3+O(OH) found as the mineral goethite. Red-brown colour.

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

There are also several other variants.

See also

A number of these compounds are found in rust and rusticles.