Spectrum Visible and near infrared reflectance spectrum of amorphous silica from crater wall(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate-rich coatings (alunite) from an altered crater wall(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate-rich coatings (jarosite) from an altered crater wall(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate (jarosite, alunite) and hematite-bearing coatings from an altered crater wall(Solfatara Crater, Italy)

Spectrum Visible and near infrared reflectance spectrum of sulfur needles from within a fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate deposits (alunogen, alum-K) from within a fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate deposits (alunogen, alum-K, Goldichite) from within a fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate deposits (alunite,alunogen, alum-K) from within a fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate deposits (alunogen, alum-K) from within a fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate deposits (alunogen, alum-K, alunite) from within a fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate deposits (alunogen) from within a fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate deposits (alunogen, Goldichite) from within a fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of sulfate deposits (alum-K, alunogen, alunite) from within a fumarolic vent(Solfatara Crater, Italy)

Spectrum Visible and near infrared reflectance spectrum of As and Hb -bearing sublimates from a 160°C fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of As and Hb -bearing sublimates from a 160°C fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of As and Hb -bearing sublimates from a 160°C fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of As and Hb -bearing sublimates from a 160°C fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of As and Hb -bearing sublimates from a 160°C fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of As and Hb -bearing sublimates from a 160°C fumarolic vent(Solfatara Crater, Italy) Spectrum Visible and near infrared reflectance spectrum of white rock from a 160°C fumarolic vent(Solfatara Crater, Italy)