Rock Name
Preview
Color
Black with white, pink crystals
Setting
Extrusive
Texture
bi-modal
Permission Statement
This image may only be used for noncommercial educational and scholarly purposes. Please contact the Department of Geology at the University of Dayton to inquire about permission to use a specific digital resource.
Recommended Citation
"Basalt Porphyry" (2014). Igneous Rocks. Image 2.
https://ecommons.udayton.edu/geo_igneous/2
COinS
Comments
A fine crystal size groundmass (basalt) surrounding coarse crystals indicates two phases of cooling, an initial slow phase, followed by a faster, extrusive formation of the basalt.