Porphyry Photos
Cochise College
Photos of Rocks
Igneous Rocks
Virtual Geology Museum
Hall of Rocks
Geology Home Page
Roger Weller, geology instructor
Porphyry Photos
Porphyry
last edited: 11/27/07 number of photos: 11
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.
photos
porphyry:
1
2
porphyry, field exposures: 1
porphyry, granite porphyry:
1
2
quartz felsite porphyry:
1
Photos are copyright free for
non-commercial educational uses.
Just credit photos to R.Weller/Cochise
College.
copyright 2007-R.Weller