Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 298 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 275 K (first) Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 275 K (last) Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 255 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 230 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 205 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 180 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 160 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 140 K (cooling) Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 140 K (warming) Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 125 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 110 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 100 K Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 90 K (first) Spectrum VNIR reflectance of Thenardite 36-50 µm grain size at T = 80 K