Ferrihydrite chemical composition

Ferricytochrome c, 32 49 NIR MCD spectrum, 36 233-234 Ferrihemoproteins, reduction rates, 36 430-431 Ferrihydrite, 36 422 chemical composition, 36 455 inside apoferritin cavity, 36 459 mineralization in iron storage proteins, 36 161-164... 

Ferrihydrite A group of iron (oxy)(hydr)oxide compounds with highly variable chemical compositions. Rather than determining the potentially complex chemical formula of every ferrihydrite sample, researchers often classify the compounds by their number of broad powder X-ray diffraction (XRD) peaks, which include the poorly crystalline two-line and better crystalline six- or seven-line varieties. 

Many studies have demonstrated that at certain critical Fe/Al ratios, Fe and Al ions may coprecipitate, forming short-range-ordered mixed oxides (aluminous ferrihydrites) of different chemical composition, size, nature, solubility, and reactivity (Cornell and Schwertmann, 1996 Colombo and Violante, 1996). 

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