Metavivianite an intermediate mineral phase between vivianite, and ferro/ferristrunzite – a Raman spectroscopic study

Authors: Frost, Ray L.; Weier, Matt; Lyon, William G.

Source: Neues Jahrbuch für Mineralogie - Monatshefte, Volume 2004, Number 5, 1 May 2004 , pp. 228-240(13)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

A comparison between the minerals vivianite, metavivianite, and ferro/ferristrunzite is made using Raman spectroscopy. The Raman spectrum of metavivianite is broad and more closely resembles the spectrum of ferro/ferristrunzite than vivianite. This is not unexpected since both minerals are triclinic. Metavivianite is characterised by a broad profile in the hydroxyl stretching region with bands observed at 3368 and 3133 cm^-1. The width of the bands indicates the structure of metavivianite is disordered. In the PO stretching region bands are observed at 1123, 1060, 1005 and 958 cm^-1 and are assigned to the stretching modes. Vivianites with partial oxidation are characterised by a sharp OH stretching band observed around 3480 cm^-1 in the Raman spectrum. It is proposed that metavivianite is a transitional oxidation phase between the vivianite and the ferro/ferristrunzite end members.

Keywords: FERRIC; FERRISTRUNZITE; PHOSPHATE; VIVIANITE; METAVIVIANITE; RAMAN SPECTROSCOPY

Document Type: Regular paper

DOI: 10.1127/0028-3649/2004/2004-0228