Rectilinear fragment with one polished, undecorated face. Same unusual material surface is dark green gray color often with a crackled texture. All incised marks are very finely executed and very crisp.
From Nubia (Sudan), Gebel Barkal, B502 W. 1919: 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