Dacite Photos
Cochise College
Photos of Rocks
Igneous Rocks
Virtual Geology Museum
Hall of Rocks
Geology Home Page
Roger Weller, geology instructor
Dacite Photos
Dacite
last edited: 11/15/07 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.
photos
mica dacite porphyry:
1
2
Photos are copyright free for
non-commercial educational uses.
Just credit photos to R.Weller/Cochise
College.
copyright 2007-R.Weller