UV/visible reflectance ratios of silicate-opaque mixtures and space-weathering analogs in wavelengths relevant to Mariner 10 (right) and MDIS (left). Spectral reflectances were collected by A. N. Shackelford et al. (2025b) of mixtures of low-Fe enstatite (red-orange) and forsterite (green). Marker shapes indicate the mixing component: triangle  =  none (pure silicate), hexagon  =  graphite, circle = carbon black. Marker edge colors indicate unirradiated (blue) and irradiated (red) samples. Solid black markers represent pure, unirradiated opaques.