Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 270K (down) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 90K (down) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 100K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 110K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 120K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 130K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 140K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 150K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 160K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 180K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 200K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 220K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 245K (up) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Tschermigite (PE alpha-Ammonium aluminium sulfate dodecahydrate) powder at 270K (up) with 32-80 µm grain sizes