A hard unglazed brownish-red earthenware, or the clay from which it is made (5,5)
I believe the answer is:
terra cotta
(Other definitions for terra cotta that I've seen before include "Red-brown colour" , "Brown-red earthenware" , "Brownish-red earthenware" , "Unglazed earthenware used as building material" , "Collection of Chinese warrior sculptures, discovered 1974" .)