In , in their Table , we can find data about limestone provided by the authors, and Raman data from , and infrared data from . The table is also reporting the assignments. In the following table we give the centers of the bands as published by In , where an investigation of the infrared spectra of calcium carbonate is given, we can find a discussion "of the strong broad absorption in the 1600-1400 cm -1 region at normal temperature and at low temperature". The "careful examination" of this band "indicates that this absorption originates from several overlapping bands". In the case of aragonite, bands are estimated by Andersen and Brecevic at 1570, 1525, 1488, 1473 and 1440 cm -1 . No information is available about the line shapes used for decomposition and the relative role of the components.