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J.T. Kloprogge, D. Visser, W.N. Martens, L.V. Duong and R.L. Frost 2003. Identification by RAMAN Microscopy of magnesian vivianite formed from Fe2+, Mg, Mn2+ and P043-’ in a Roman camp near fort Vechten, Utrecht, The Netherlands. Netherlands Journal of Geosciences. 82, (Jul. 2003), 209-214. DOI:https://doi.org/10.1017/S0016774600020758.