Biogenic calcites show various chemical contents (Sr and Mg) related to the systematic position of the organisms. It is well known that algae, octocorallia, and echinoderm tests are composed of high Mg
calcites, whereas mollusc shells are composed of lower Mg calcites. DRIFT (diffuse reflectance infrared Fourier transform) spectra show that the frequency of the upsilon 4 band significantly differs in
the high Mg calcite and low-Mg calcite set. The upsilon 1 band and the doublet upsilon 2 do not seem to be altered. There is a strong positive linear correlation between the upsilon 4 wavelength and Mg
concentrations in these biological calcites. The linear correlation between the upsilon 4 wave- length and Sr concentrations is only 0.59. It is known that the calcite-dolomite transition shifts the wavelength
of the upsilon 4 band, but such a shift has not been observed in the single calcite.
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