Slab of polished hornblende diorite typical of palettes used for grinding eye-paint found in graves of A Group culture. On one side is stuck a large label from the 1922 Sotheby's auction of Reverend William MacGregor's collection. CONDITION NOTE (1998): Worn, label adhered to surface. Wellcome Historical Medical Museum accession no.17285; Purchased for Henry Wellcome at Sotheby's 26 June - 6 July 1922 (MacGregor Collection) Lot 1116: "Three Grinder Stones, one in aragonite, 6 1/2 in. by 4 1/4 in.; the others in black and white mottled granite, the larger 5 1/2 in. by 33/8 in., the smaller 4 5/8 in by 3 3/4 in.; also a section of a nodule of flint almost circular, with a coating of white silica enclosing it like a ring".