Chernikovite, a uranium phosphate, was found in a pegmatite body from the # 4 pit, Mayfield, Fulton County. It occurs as small squared yellow crystals along the cleavages and fractures in microcline. Until now, the compositional and structural data for chernikovite were reported only on synthetic material. The first chemical data on natural chernikovite were determined on the crystals from Mayfield. This seems to be the forth occurrence of this mineral in the USA.