Porphyry

A dark purplish-red igneous rock. A hard material, it takes a high polish and is valued for sculpture and architectural decoration.

Works of Art

A dark purplish-red igneous rock. A hard material, it takes a high polish and is valued for sculpture and architectural decoration.

Works of Art

c. 6000–1000 B.C.E.

c. 305 C.E.

312–315 C.E.