Diorite Photos
Cochise College
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Roger Weller, geology instructor
Diorite Photos
Diorite
last edited:
2/16/11
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 2011-R.Weller