: Paléoclimatologie: iron oxide

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iron oxide

Iron oxides are chemical compounds composed of iron and oxygen. Several iron oxides are recognized. Iron oxides are widespread in nature and play an important role in many geological and biological processes. Iron oxides feature as ferrous (Fe(II)) or ferric (Fe(III)) or both. They adopt octahedral or tetrahedral coordination geometry. Only a few oxides are significant at the earth's surface, particularly wüstite, magnetite, and hematite. Oxides of Fe(II), FeO: iron(II) oxide, wüstite. Mixed oxides of Fe(II) and Fe(III), Fe3O4: Iron(II,III) oxide, magnetite; Fe4O5; Fe5O6; Fe5O7; Fe25O32; Fe13O19. Oxides of Fe(III), Fe2O3: iron(III), ferric oxide with four phases; oxide α-Fe2O3: alpha phase or hematite; β-Fe2O3: beta phase; γ-Fe2O3: gamma phase or maghemite; ε-Fe2O3: epsilon phase. (Adapted from: https://en.wikipedia.org/wiki/Iron_oxide)

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