This data are relative to the polarization measurements of the paper "Reflection, emission, and polarization properties of surfaces made of hyperfine grains, and implications for the nature of primitive small bodies" The dataset consists in 8 .txt files that represent the polarization measurements of mixtures of FeS and Olivine (ol) with different mass ratios. In the name of each file it is specified the mass percentage of the two components respect with the total mass of the sample (eg. data_ol_FeS_10-90_530.txt is the sample composed by 10% olivine and 90% FeS, measured at 530 nm). In each file, the data are organized in the following columns: #phase_angles[°] #Q/I #U/I #V/I #DOLP #DC #delta_Q/I #delta_U/I #delta_V/I #delta_DOLP #delta_dc "delta" refers to the standard deviation of the measurement upon rotation of the sample on the azimuthal axis.