The crystalline α-FeOOH goethite was obtained precipitating by hydrolysis a ferric oxalate solution, with additional adjusting NaHCO3 solution. The hydrolysis of a ferrous chloride solution is giving γ-FeOOH lepidocrocite. In the Table According to Hanesch, the measured spectrum of synthetic goethite "corresponds to the spectra of this mineral shown in the literature" (M. Hanesch is mentioning . "The combination of a strong peak at 385 cm -1 with clear peaks at 244, 299, 480, 548 and 681 cm -1 is easy to distinguish from any other spectrum. Synthetic goethite was measured with a laser power of 0.1 mW" .