Original paper

Quantitative IR spectroscopic determination of the component H2O in staurolite

Koch-Müller, Monika; Langer, Klaus

European Journal of Mineralogy Volume 10 Number 6 (1998), p. 1267 - 1274

12 references

published: Dec 1, 1998
manuscript accepted: May 29, 1998
manuscript received: Feb 11, 1998

DOI: 10.1127/ejm/10/6/1267

BibTeX file

ArtNo. ESP147051006012, Price: 29.00 €

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Abstract Staurolite exhibits a complex IR absorption band system in the range of 3750 to 3250 cm-1 due to OH stretching vibrations. The bands show a strong pleochroism with nearly no absorbance in spectra with E // b and strong (intermediate) absorbance in spectra with E // a (E // c). The total integrated absorbance was determined from spectra of (010) staurolite plates. These spectra were polarized with E // a and E // c. The total integrated molar absorption coefficient (εi,tot = 83000 ± 5000 l-mol H2O-1·cm-2) was calculated using H2O contents as determined from independent physico-chemical measurements (“Karl-Fischer” titration). Based on Lambert-Beer’s law, the content of the component H2O in staurolite is obtained with a relative standard deviation of 9 % (1 α) using this εi,tot value and by measuring the total integrated absorbance of the whole band system from polarized spectra of a (010) staurolite plate. The quantitative IR data on staurolite are in good agreement with the IR absorption calibrations for water in minerals by Paterson (1982) and Libowitzky & Rossman (1997)


stauroliteOH stretching vibrationsIR absorption spectroscopywater contenttotal integrated molar absorption coefficient