| Name | Porphyritic Andesite |
| Texture | Porphyritic |
| Origin | Extrusive/Volcanic |
| Chemical Composition | Intermediate |
| Color | Dark Green |
| Mineral Composition | Sodium - Calcium Plagioclase, Pyroxene, Hornblende |
| Miscellaneous | Hornblende Phenocrysts in an aphanitic (fine-grained) groundmass |
| Tectonic Environment | Convergent Boundary - both Island Arc-type and Andean-type subduction zones |
