This porphyritic palette (diorite), has red writing upon it reading '5 flat polishing stones from Naqada Casira Jan 8 1902'. It dates from the Neolithic to Predynastic Period. Hard stone palettes such as these made of stones other than greywacke may sometimes be earlier in date than the greywacke ones. They have been found in both Nubia and in Egypt. Examples have been found at Naqada and Gerzeh which Petrie dated as probably Early Dynastic (Petrie 1920, 39-40). One also comes from Morgan's excavations at el Masa'id dated to Naqada III (Needler 1984, 319, 326). Petrie and Needler believed that examples found in Egypt originated in Nubia and indeed there seem to have been strong contacts between the A-Group Nubian culture and Predynastic Egypt. Hardstone palettes are found in Nubian A-Group burials (Nordström 1972, pl. 191) dated 3700-3250 BCE. A Nubian grave in Kadruka dated to c 6000-6500 BCE contained a diorite palette with the remains of an adult male (Pardo Mata 2004, 140). It was purchased by Wellcome at auction in 1923.