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



last edited:  11/7/16    number of photos:  2
Dacite is an extrusive igneous rock, often porphyritic, that
has the same mineral composition as a quartz diorite. 
It contains plagioclase, quartz, pyroxene or hornblende. 
Biotite and sanidine (a variety of orthoclase feldspar)
may also be present.

mica dacite porphyry:  1  2


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