PYROXENE SPECTRA from Bowey, J. E., Hofmeister, A., Keppel, E. 2020 MNRAS, 497, 3658 Infrared Spectra of Pyroxenes (Crystalline Chain Silicates) at Room Temperature https://doi.org/10.1093/mnras/staa2227 We present quantitative room-temperature spectra of 17 Mg-, Fe-, and Ca-bearing ortho- and clinopyroxenes, and a Ca-pyroxenoid in order to discern trends indicative of crystal structure and a wide range of composition. Data are produced using a diamond anvil cell: our band strengths are up to six times higher than those measured in KBr or polyethylene dispersions, which include variations in path length (from grain size) and surface reflections that are not addressed in data processing. This is the README.txt file in the upload. Data doi is : 10.5281/zenodo.5564539 PYROXENE SPECTRA from Bowey, J. E., Hofmeister, A., Keppel, E. 2020 MNRAS, 497, 3658 Infrared Spectra of Pyroxenes (Crystalline Chain Silicates) at Room Temperature https://doi.org/10.1093/mnras/staa2227 Spectra are in Figure 4 and compositions are listed in Table 1. Fig 4 Left: En-Fs orthopyroxenes (orthoplot.pdf) En99tau.dat En92tau.dat En90tau.dat En85tau.dat (lower resolution MID-ir spectrum) En55tau.dat En40tau.dat En12tau.dat En1tau.dat Pigeonite: Wo10En62tau.dat Right: Clinopyroxenes in the Enstatite-Diopside-Wollastonite Diopside-Hedenbergite solid-solution series (enst-wol.pdf) En-Dp series. Wo21En79tau.dat Wo30En70tau.dat Wo40En60tau.dat Wollastonite: Wo99En1tau.dat Dp-Hd series Wo50En50tau.dat Wo50En47tau.dat Wo49En36tau.dat Wo47En6tau.dat Pigeonite: Wo36En37tau.dat files are two column ascii. column 1 increment varies between files. column 1 (x) is in increasing wavenumber (cm^-1) column 2 (tau) is absorbance in optical depth units per micron thickness of sample. col1: x to wavelength (micron) conversion is 10^4/x col2: tau to mass absorption coefficient conversion (kappa) is tau * 10^4/rho where rho is the mass density of the specimen (gcm^-3), estimates are in table 1 [Note that kappa contains inherent uncertainties due to the spacing between the grains sampled and the effects discussed in Section 7.1]