Spectral library creation of garnet in Kadavur Basin, Karur District, Tamil Nadu, India – A lab-based spectral library creation

Abstract

The significance of the study is to create a spectral library for the mineral Garnet. The spectra for Garnet created in the darkroom environment for the study. The laboratory spectra created matched with the USGS spectral library and made confirmation for the spectra. For the spectral resampling and spectral matching, ASTER data used as the reflectance file. The wavelength of the laboratory spectra is between 0.556 to 2.4 micrometres. The highest reflectance spectral curve of the laboratory spectra shows 1.00 reflectance value and the wavelength is 0.807 μm. The USGS spectra also indicate the same value and wavelength. The absorption value changes in lab spectra at 0.57 reflectance value at the wavelength of 1.65 μm. The USGS spectra display 0.506 absorption value at the same wavelength of the laboratory spectra. The USGS spectra of the Garnet shows that the Garnet collected from the study area is Spessartine garnet. The laboratory spectral library thus created can be used for the mineral identification and also the spectral library thus created can use for further studies.