Beautifully textured and patterned onyx with volcanic pyroclastic breccia has been used by the famous sculptor Emily Young to create this fabulous head called Stillness Born of History II displayed (courtesy of Bowman Sculpture) at Neo Bankside in London, England, just south of the Tate Modern Gallery. Pyroclastic breccia is composed of fine-grained volcanic ash, pumice, and rock fragments larger than 2.5 inches (63.5 mm). When the fragments are smaller than this, the rock is called tuff.
This wonderful sculpture, Tempesta, is one of a group carved with consummate skill by Emily Young from multi-patterned and textured clastic igneous rock. I am unable to find the source of the stone. It is displayed, courtesy of Bowman Sculpture, at Neo Bankside behind the Tate Modern Gallery in London, England. The rock is amazing in its complexity and the work has taken advantage of the challenging medium by exploiting both its natural beauty and its flaws.