AgIn13S20 single crystals were grown by the vertical Bridgman method. The grown crystals composition was determined by X-ray spectroscopy analysis; the crystal structure was determined by X-ray method. It was shown, that AgIn13S20 compound crystallize in the
cubic spinel structure. The band gaps of the obtained single crystals were estimated from transmittance spectra in the temperature range of 10-320 K. The band gap values decreased with temperature
