Igneous Rock Photos  
Cochise College                  
Photos of Rocks  
Geology Home Page                       

Roger Weller, geology instructor 
( wellerr@cochise.edu )
return to: Rocks

Igneous Rock Table  (shows relationships)

Index
Number of photos: 538     Last edited:  10/26/16
Quick Tour: 10 Common Igneous Rocks
 

glassy                                                                   

    obsidian  (48)

    pumice  (29)

    pitchstone  (13)

    perlite  (14)                                                                  
fine grained (aphanitic) 
    andesite  (29)

    basalt  (62)
    dacite  (2)
    diabase  (6)
    phonolite  (2)
    rhyolite  (30)
    trachyte  (4)
    tuff  (42)
    lithophysa  (21)

coarse grained (phaneritic)
    anorthosite  (4)                                                             
    aplite  (2)
    diorite  (33)                                     
    dunite  (2)                                                                             
    gabbro  (26)

    granodiorite  (3)                                                                                   

    granite  (66)
    kimberlite  (2)
    monzonite  (17)  
    peridotite  (6)      
    pyroxenite  (2)                    
    syenite  (10)
very coarse grained

    pegmatite  (36)

porphyritic

    porphyry  (19)
 

igneous structures   (10)

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Just credit photos to R.Weller/Cochise College.
copyright 2015-R.Weller