Spectrum $DoLP_Q$ of FeS (grain size up to 100 μm) measured at scattering angle = 20° Spectrum $DoLP_Q$ of FeS (grain size up to 100 μm) measured at scattering angle = 30° Spectrum $DoLP_Q$ of FeS (grain size up to 100 μm) measured at scattering angle = 40° Spectrum $DoLP_Q$ of FeS (grain size up to 100 μm) measured at scattering angle = 50° Spectrum $DoLP_Q$ of FeS (grain size up to 100 μm) measured at scattering angle = 60° Spectrum $DoLP_Q$ of FeS (grain size up to 100 μm) measured at scattering angle = 80° Spectrum $DoLP_Q$ of FeS (grain size up to 100 μm) measured at scattering angle = 100° Spectrum $DoLP_Q$ of FeS (grain size up to 100 μm): scattering angle = 120° Spectrum DoLP_Q of FeS (grain size up to 100 μm) measured at scattering angle = 140°