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

wellerr@cochise.edu

 

Diorite
last edited:  11/8/16    number of photos:  33
Diorite is a coarse-grained (phaneritic), plutonic igneous rock.                              
It is composed mostly of sodium-rich plagioclase feldspar with
some hornblende, biotite, or pyroxene. 
Small amounts of quartz and orthoclase feldspar may also be present.                                              
It is sometimes referred to a a "white granite" by stonecutters
because of the abundance of white albite feldspar.

 

photos
diorite, polished:  1  2  3  4  5  6  7
diorite porphyry:  1  2
diorite from New Jersey:  1  2
quartz diorite (tonalite):  1  2
diorite from California:  1  2  3  4  5  6  7
diorite-misc.:  1  2  3  4  5  6  7  8  9  10  11  12
epidote vein in diorite: 
1

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

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