This is a rectilinear fragment of a statue base with three worked sides. The bottom edge is beveled. The stone is highly polished, dark brown, fine grained greywacke.
From Nubia (Sudan), Kerma, K IV grave K 405 debris. 1913: Excavated by the Harvard University–Boston Museum of Fine Arts Expedition; assigned to the MFA by the government of Sudan.
Harvard University—Boston Museum of Fine Arts Expedition