Reflectance spectra diversity of silica-rich materials: Sensitivity to environment and implications for detections on Mars

► We present reflectance spectra of a diverse suite of silica-rich materials. ► The form of H2O/OH in silica-rich materials can have large effects on their spectra. ► The ∼1.4, 1.9 and 2.2 μm features can be help discern between forms of silica. ► Spectral parameters can help characterize silica-bearing deposits on Mars. ► Out results can be applied to CRISM, OMEGA, Pancam and Mastcam observations.