Rectilinear fragment with 3 polished flat surfaces. This piece is unusual in that it has two surfaces which are perpendicular, but the third is at a 45 degree angle to the others.
From Nubia (Sudan) Gebel Barkal, B900 Ex2 debris. 1920: 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