R905/R750 versus albedo (R750) for samples with different weathering degrees. Besides the four minerals (PLG, ILM, OPX, and OLV) measured in this work, we also incorporated the data of olivine (OLV-Y) used by Yang et al. (2017), orthopyroxene (OPX-J), and the lunar regolith simulant (LRS) used by Jiang et al. (2019). The OLV-Y, OPX-J, and LRS all have a particle size distribution of <45 μm and have undergone different degrees of weathering simulated using a pulse laser irradiation system. The unirradiated samples of the OLV-Y and OPX-J have the same bulk compositions as the OLV and OPX used in this work. The LRS sample is a JSC-1A (McKay et al. 1994) lunar regolith simulant sieved to <45 μm. The spectra of the OLV-Y, OPX-J, and LRS were measured under a bi-conical configuration with (i, e, g) = (~45°, ~45°, ~90°).