31. The peperino, much used at Rome and Naples as a building stone, is a trachyte tuff. 32. There are also 13 moai carved from basalt, 22 from trachyte and 17 from fragile red scoria. 33. They are excavated mainly in granite and trachyte , but also in the limestone, basalt and marl. 34. Lava domes and flows are composed of trachyte and the cinder cones consist of basaltic and trachybasaltic lava. 35. The central pillar sits on a simply detailed trachyte base and is flanked by sections of banded stone. 36. The field is dominated by trachyandesite and trachydacite, ranging from tephrite over trachyandesite to trachyte and rhyolite. 37. Geologically, the law is a volcanic plug of hard phonolitic trachyte rock of Carboniferous ( Dinantian ) age. 38. At least three of these eruptions were accompanied by trachyte dome extrusions in the final phases of the eruption. 39. The porch has a trachyte floor and steps, a cedar entrance door and etched glass panels and sidelights. 40. On the rocky summit of the Spitzberg, the grey and black columns of the trachyte basalt are exposed.
