Spectrum Olivine Hawaii Forsterite Fo88 sand 45-75 µm (C1) grains Vis-NIR reflectance Spectrum Olivine Hawaii Forsterite Fo88 sand 75-125 µm (C2) grains Vis-NIR reflectance Spectrum Olivine Hawaii Forsterite Fo88 sand 125-250 µm (C3) grains Vis-NIR reflectance Spectrum Olivine Hawaii Forsterite Fo88 sand 250-500 µm (C4) grains Vis-NIR reflectance Spectrum Olivine Hawaii Forsterite Fo88 sand 500-1000 µm (C5) grains Vis-NIR reflectance Spectrum Olivine Hawaii Forsterite Fo88 sand 1000-2000 µm (C6) grains Vis-NIR reflectance