Spectrum Vis-NIR reflectance spectrum of powdered Olivine (100-200 µm grains) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Olivine (25-50 µm grains) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Olivine (grains smaller than 25 µm) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Olivine (sub-µm grains) in a compact surface at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered olivine (sub-µm grains) in a porous surface at ambient temperature

Spectrum Vis-NIR reflectance spectrum of powdered Smectite-rich material (100-200 µm grains) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Smectite-rich material (50-100 µm grains) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Smectite-rich material (grains smaller than 50 µm) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Smectite-rich material (sub-µm grains) in a compact surface at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Smectite-rich material (sub-µm grains) in a porous surface at ambient temperature

Spectrum Vis-NIR reflectance spectrum of powdered Amorphous Silica (100-200 µm grains) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Amorphous Silica (50-100 µm grains) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Amorphous Silica (grains smaller than 50 µm) at ambient temperature Spectrum Vis-NIR reflectance spectrum of powdered Amorphous Silica (sub-µm grains) in a compact surface at ambient temperature