| Some rocks have basaltic compositions similar to the well-studied meteorites thought to have come from Mars, but other rocks are more like the volcanic rock andesite. |
| Nevado del Ruiz volcano is an andesite stratovolcano located in the northern Andes of Colombia. |
| Both the sandstone and andesite show strong quartz and chert veining and carry disseminated pyrite. |
| Made from a single slab of andesite weighing at least 10 tons, this monolith is carved in the form of a doorway with niches on either side. |
| In the Breidden district are the barren Criggeon shales with ashes and flows of andesite. |
| The rocks thus extruded are mainly composed of dark, heavy basic material, such as basalt and andesite. |
