There are a number of iron oxides:
Iron (II) oxide (FeO) The powder in particular can cause explosions as it readily ignites. Colour black.
Iron (III) oxide, (Fe2O3) known in its natural state as Haematite, but also purified for use as a coating in magnetic audio and computer media, where
it is known as Ferric oxide.
Iron (II, III) oxide (Fe3O4), better known as the mineral Magnetite or lodestone. Colour black.
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.
|