In the presence of 9.6 mol% silicate species, goethite (α-FeOOH) grows from ferrihydrite (5Fe2O3·9H2O) at pH 12.5 as a mixture of pseudohexagonal plates and bipyramids, whereas in the absence of silicate species, acicular crystals of goethite are formed.
R. M. Cornell and R. Giovanoli, J. Chem. Soc., Chem. Commun., 1987, 413 DOI: 10.1039/C39870000413
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