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American Mineralogist; January 2007; v. 92; no. 1; p. 1-18; DOI: 10.2138/am.2007.2170
© 2007 Mineralogical Society of America
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Mid-infrared emission spectroscopy of sulfate and sulfate-bearing minerals

Melissa D. Lane*

Planetary Science Institute, 1700 E. Fort Lowell Road, Suite 106, Tucson, Arizona 85719, U.S.A.

Correspondence: * E-mail: lane{at}psi.edu

Mid-infrared thermal emission spectra were acquired and are presented for 37 different sulfate minerals representing Strunz classes 6/A-D as well as a few other miscellaneous sulfate-bearing minerals (Strunz class 3/C and 8/J). Sulfate vibrational modes are assigned to each spectrum; also assigned are the modes of component OH, H2O, and carbonate where applicable. A discussion also is presented regarding the effect of hydration state on the emissivity spectra; dehydration of the Ca-sulfate mineral series (e.g., gypsum-bassanite-anhydrite), as well as the Mg-sulfate series, causes the high-frequency edge of the sulfate {nu}3 band to shift to a larger wavenumber.

Key Words: Mid-infrared • vibrational • spectroscopy • emissivity • emission • sulfate • spectra




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