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