Examples of visible to NIR reflectance spectra of CM2 carbonaceous chondrites. The reflectances are shown in absolute units (i.e., fraction of reflected light). The spectra are almost flat in Y and J bands and then turn extremely red in J and Ks bands (almost doubling their reflectance value). These types of compositions may explain the unclassified group with (Y − J) ≈ 0.3 and (J − Ks) ≥ ~ 0.6.