Spectrum Multiangular reflectance of Ysson basalt in 5 Vis bands (250-500 µm grain size) Spectrum Multiangular reflectance of controled mixing of 15% synthetic Ysson basaltic glass with 85% natural Ysson basalt, in 5 Vis bands (250-500 µm grain size) Spectrum Multiangular reflectance of controled mixing of 30% synthetic Ysson basaltic glass with 70% natural Ysson basalt, in 5 Vis bands (250-500 µm grain size) Spectrum Multiangular reflectance of controled mixing of 50% synthetic Ysson basaltic glass with 50% natural Ysson basalt, in 5 Vis bands (250-500 µm grain size) Spectrum Multiangular reflectance of controled mixing of 70% synthetic Ysson basaltic glass with 30% natural Ysson basalt, in 5 Vis bands (250-500 µm grain size) Spectrum Multiangular reflectance of glass basalt Ysson in 5 Vis bands (250-500 µm grain size)