We have seen that glucose can be used for obtaining the nanoparticles. Here it is therefore worthwhile to mention biological processes. In , we can find the "formation of Fe(II)-containing mineral through microbial processes". This formation "may play an important role in iron and carbon geochemistry in subsurface environments. Fe(III)-reducing bacteria form Fe(II)-containing minerals such as siderite, magnetite, vivianite, and green rust using iron oxides" . Lee and coworkers, in their article, are proposing the "biomineralization" of akaganeite, which is a "poorly crystalline Fe(III) oxide", by means of "an anaerobic Fe(III)-reducing bacterium (Shewanella alga) isolated from marine environment" . We have the occasion to show the Raman spectrum of Akageneite provided by ROD database. Monika Hanesch is also proposing the Siderite Raman spectrum, telling that it is "easy to obtain as the mineral is stable at moderate laser power". The bands that Hanesch has evidenced are coincident with "published siderite bands (e.g. ) at 184, 287, 731 and 1090 cm -1 ". The chemical systematic name of Siderite is iron(II) carbonate. For the interpretation of the Raman spectrum of Siderite, see please the database by Buzgar N., Apopei A. I., Buzatu A., 2009, Romanian Database of Raman Spectroscopy (), at the following link . It is told that the Siderite Raman spectrum is "characterized by the same band of calcite", which is "corresponding to the symmetric stretching of CO3 group". The two bands at low Raman shift values are due to T(Fe, CO3) mode.