This amulet is made of quartz. There is a hole through top, with the base broken off. The amulet represents the djed-pillar. The pillar, which symbolized the spinal column of the funerary god Osiris, was the hieroglyphic symbol for stability.
From Nuri, Pyramid LIX. Feb. 1918: Excavated by the Harvard University-Museum of Fine Arts Expedition; assigned to the MFA by the government of Sudan.
Harvard University—Boston Museum of Fine Arts Expedition