• journal_title：European Journal of Mineralogy
• Contributor：Monika Koch-Mueller ; Klaus Langer
• Publisher：E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
• Date：1998-
• Format：text/html
• Language：en
• journal_abbrev：Eur J Mineral
• issn：0935-1221
• volume：10
• issue：6
• firstpage：1267
• section：Articles

Staurolite exhibits a complex IR absorption band system in the range of 3750 to 3250 cm (super -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 (epsilon (sub i.tot) = 83000+ or -5000 l.mol H ₂ O-1.cm (super -2) ) was calculated using H ₂ O contents as determined from independent physico-chemical measurements ("Karl-Fischer" titration). Based on Lambert-Beer's law, the content of the component H ₂ O in staurolite is obtained with a relative standard deviation of 9% (1sigma ) using this epsilon (sub i.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).