| These rough schist slabs are also called phonolite because of the bell-like sound they produce when you hit them. |
| Alkaline rocks include many with unusual names, but the more common alkali-basalt, syenite, and phonolite are included in the group. |
| Different types of rock could be used to make Lauze, often metamorphic rock that splits into sheets, but sometimes also volcanic rock: phonolite. |
| At last we draw ourselves up a huge wedge of phonolite and find ourselves at the summit of the first peak. |
| The lava flows within the pyroclasts are composed of nephelinite and phonolite. |
| South of the city of Isparta pyroclastic rocks are interbedded with rhyolite, trachyte, phonolite and lamproite flows. |
