Figure 1. Plot of reference laboratory spectrum of quartz from Salisbury et al. (1991), converted to qualitative emissivity using Kirchoff's Law. The spectrum at original resolution is shown in blue. The spectrum convolved to ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) spectral resolution (Table 1) is shown in red. ASTER band centers are also shown. Note quartz reststrahlen absorption features at bands 10 and 12.