Biogenic silicate glass-ceramics were synthesized from the rice husk (RH) and eggshell powder (ESP) using the melt-quench method. The FWHM (0.37-0.39), crystallite size (0.351- 0.370 nm) increased and the bandgap decreased from 3.43 to 3.15 eV as the ESP concentration increased from 10 to 20...