Porphyry Photos
Cochise College
Photos of Rocks       

Igneous Rocks
Geology Home Page
Roger Weller, geology instructor                       

wellerr@cochise.edu    copyright 2011   
 

porphyry, cut-2
The phenocrysts are the black crystals.


porphyry                                                                                                                                            2a

Photo is copyright free for non-commercial educational uses. 
Just credit photo to R.Weller/Cochise College.