This is a fragment with one worked surface. The stone is black granodiorite with sporadic black biotite inclusions and mica, the break areas look granulated. GD5.
From Nubia (Sudan), Kerma, K III 6(1). 1914: Excavated by the Harvard University–Boston Museum of Fine Arts Expedition; assigned to the MFA in the division of finds by the government of Sudan.
Harvard University—Boston Museum of Fine Arts Expedition