Porfido Rosso (porphyry)

Small fragment of porfido rosso, also known as porphyry. The color is deep reddish-purple, with white and black inclusions. The thickness of the sample is an even 1 cm throughout and there are traces of mortar on the back, suggesting this could be a tile for a floor or wall. The top surface is polished and smooth. All four edges are uneven.