Porphyritic Basalt
![](https://geology.ecu.edu/geol1501/wp-content/pv-uploads/sites/351/2020/06/porphyritic-basalt.gif)
Type | Igneous Rock |
Texture | Porphyritic |
Origin | Extrusive/Volcanic |
Chemical Composition | Mafic |
Color | Dark Gray to Black |
Mineral Composition | Calcium Plagioclase, Pyroxene |
Miscellaneous | Calcium Plagioclase phenocrysts in an aphanitic (Fine-grained) groundmass |
Tectonic Environment | Divergent Boundary or Intra-oceanic hot spots |