Porphyry Photos                   
Cochise College
Photos of Rocks
Igneous Rocks
Geology Home Page
Roger Weller, geology instructor                       


porphyry with weathered feldspar phenocrysts


last edited:  11/16/16    number of photos:  19
Porphyry is an igneous that has two different crystal sizes                
in the same rock.  The larger crystals are called phenocrysts
and the finer crystals are referred to as the groundmass or matrix.

porphyry:  1  2  3  4  5   

porphyry, cut:  1  2  3  4  5  6  7  8  9   

porphyry, field exposures:  1 

porphyry, granite porphyry:  1  2    
quartz felsite porphyry:  1 
weathered feldspar phenocrysts: 


Photos are copyright free for non-commercial educational uses. 
Just credit photos to R.Weller/Cochise College.
copyright 2016-R.Weller