World's first commercially available PbGa2Se4 crystals! This unique layered material is commonly known as Lead Selleno Gallanate, and used as high electron mobility Gamma-ray detectors, photodetectors, and sensors. It has an indirect gap at 2.3 eV and direct gap at 2.35 eV. Considered to quasi-direct gap semiconductor. It's properties are currently unknown in mono- and few-layer regime, and based on prior research on bulk materials it is anticipated to possess high electronic mobility.