Glycine Potassium Iodide (GPI) is a new organic crystal has been synthesized and single crystals have been grown from its aqueous solution by Slow Evaporation Solution Technique(SEST). The solubility of the material was measured at various temperatures in deionized water. Good quality of crystal of size 32x18x15 mm3 has been harvested over a period of 48days. The grown crystals were characterized by Single crystal X-ray diffraction studies shows that GPI belongs to hexagonal system and identify the crystalline nature. The grown crystals have been subjected to powder X-ray diffraction to identify the intense peaks on various planes. The UV –VIS- NIR Spectrum of the grown GPI crystals shows less optical absorption and good transmittance in the entire visible region enabling its use in optical applications