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Identification by RAMAN Microscopy of magnesian vivianite formed from Fe2+, Mg, Mn2+ and P043-’ in a Roman camp near fort Vechten, Utrecht, The Netherlands

Published online by Cambridge University Press:  01 April 2016

J.T. Kloprogge ,
D. Visser ,
W.N. Martens ,
L.V. Duong  and
R.L. frost
J.T. Kloprogge*
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, GPO Box 2434, Brisbane Q 4001, Australia; E-mail:t.kloprogge@qut.edu.au
D. Visser
Affiliation:
Utrecht University Museum, Lange Nieuwstraat 106, 3512 PN Utrecht, The Netherlands
W.N. Martens
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, GPO Box 2434, Brisbane Q 4001, Australia; E-mail:t.kloprogge@qut.edu.au
L.V. Duong
Affiliation:
Analytical Electron Microscopy Facility, Faculty of Science, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Qld 4001, Australia
R.L. frost
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, GPO Box 2434, Brisbane Q 4001, Australia; E-mail:t.kloprogge@qut.edu.au
*
*Corresponding author
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Abstract

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The presence of a magnesian vivianite (Fe2+)2.5(Mg,Mn,Ca)0.5(PO4)2·8H2O, has been identified in a soil sample from a Roman camp near Fort Vechten, The Netherlands, using a combination of Raman microscopy and scanning electron microscopy. An unsubstituted vivianite and baricite were characterised for comparative reasons. The split phosphate-stretching mode is recognised around 1115, 1062 and 1015 cm−1, while the corresponding bending modes are found around 591, 519, 471 and 422 cm−1. The substitution of Mg and Mn for Fe2+ in the crystal structure causes a shift towards higher wavenumbers compared to pure vivianite. As shown by the baričite sample substitution causes a broadening of the bands. The observed broadening however is larger than can be explained by substitution alone. The low intensity of the water bands, especially in the OH-stretching region between 2700 and 3700 cm−1 indicates that the magnesian vivianite is partially dehydrated, which explains the much larger broadening than the observed broadening caused by substitution of Mg and Mn in vivianite and baričite.

Keywords

baričiteiron phosphateRaman microscopyvivianite
Type
Research Article
Information
Netherlands Journal of Geosciences , Volume 82 , Issue 2 , July 2003 , pp. 209 - 214
Copyright
Copyright © Stichting Netherlands Journal of Geosciences 2003

Footnotes

#

Present address: Goudse Steen 15, 3961 XS Wijk bij Duurstede, The Netherlands

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