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Hydrogen incorporation in enstatite

Naturhistoriska riksmuseet, Sektionen för mineralogi, Box 50007, SE-10405 Stockholm, Sweden

^* present address: Geowissenschaftliches Zentrum der Universität Göttingen, Abteilung Angewandte und Experimentelle Mineralogie, Goldschmidtstraße 1, D-37077 Göttingen, Germany. Email: rstalde{at}gwdg.de

A series of synthetic enstatites containing up to 1000 ppm (wt) Al were analysed with FTIR-spectroscopy. Pure enstatite exhibits only two essential O-H absorption bands at 3070 and 3362 cm^–1. As Al is incorporated in the crystal the absorption band at 3362 ^cm-1 is continuously split into two other peaks. In addition several new bands above 3400 cm^–1 progressively evolve with Al incorporation. The intensities of these peaks correlate well with the Al-content of the sample. The observations are consistent with a model, where hydrogen in pure, Al-free enstatite is linked to the oxygen atoms O(3A) and O(3B), which are located at the SiO₄-tetrahedron faces pointing towards the cavity between two M2-positions along the crystallographic b-axis. In Al-bearing samples additional water is mainly incorporated between the .

Key-words: enstatite, NAMS, hydrogen, IR-spectroscopy..

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