Spectrum Near-infrared reflectance spectra of Larderellite powder at 297K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 270K (down) with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 90K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 100K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 120K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 140K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 160K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 180K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 200K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 220K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 245K with 32-80 µm grain sizes Spectrum Near-infrared reflectance spectra of Larderellite powder at 270K (up) with 32-80 µm grain sizes