Studies of OH in nominally anhydrous minerals

George R. Rossman

Division of Geological and Planetary Sciences, California Institute of Technology
Pasadena, CA 91125-2500 U.S.A.


    Hydrous components in nominally anhydrous minerals have been the object of increasing study for the past three decades. OH ions and, less commonly, H2O molecules are found in many anhydrous minerals at concentrat ions ranging from ppms to tenth's of a percent by weight. Infrared spectroscopy remains the preferred method to characterize these components because of its sensitivity to chemical species, crystallographic orientation and analytical concentration. Improved calibration of the infrared measurements provides a quantitative understanding of the importance of the global hydrogen reservoir contained in the ''anhydrous" phaises. New and revised values for the amount of H2O in anhydrous minerals are summarized.

Physics and Chemistry of Minerals 23:299-304

For more recent information, see
Rossman GR (2006) Analytical methods for measuring water in nominally anhydrous minerals. In: Keppler H and Smyth JR, eds, Water in Nominally Anhydrous Minerals. Reviews in Mineralogy and Geochemistry 62, 1-28.