This dataset contains three types of data: 1) Mid-Infrared (MIR; 5-35 micron) laboratory spectra of the Allende meteorite, 2) Measured parameters of the MIR Allende spectra, and 3) MIR spectra from the Spitzer Space Telescope of asteroids (85989) 1999 JD6, (234) Barbara, (5261) Eureka, and (114) Kassandra as described in Dausend et al., (in rev). Allende meteorite spectra files are labeled accordingly: Allende_[largest particle size]_[Allende ratio] Example: The file labeled Allende_63_70.txt contains spectra of Allende powder with 45-63 micron particle size, and an Allende:KBr ratio of 70:30. Additional information regarding Allende spectra feature parameters: We combined some features together for band parameter analyses to form ‘composite features’. A composite feature is made of two or more individual features that, together, form a larger spectral feature. In the spreadsheet these features are labeled with a ‘c’ prefix. The composite feature definitions are: cP_1 = P_1-2 (primary Christiansen Feature) cP_2 = P_3-4 cP_3 = P_5-7 cP_4 = P_3-7 (10 μm feature) cD_1 = D_2-6 Corrections: In the ‘Allende_peak_parameter’ and ‘Allende_dip_parameter’ spreadsheets, the ‘Area’ unit should be labeled as ‘μm’, not ‘μm^2’. The last column of the ‘Wavenumbers’ sheet in “Allende_dip_parameters.xlsx” is labeled as ‘cP1 error’, but it should be ‘cD1 error’.