Petrified Wood Photos          
Cochise College                                                                                                                                
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Roger Weller, geology instructor                       

wellerr@cochise.edu

Petrified Wood 
last edited:  12/20/07    number of photos: 8
Petrified wood is a cryptocrystalline form of                                    
quartz, SiO₂                                                                                          
Mineral information on quartz
Technically, petrified wood is really a form of jasper.
hardness: 7

polished petrified wood
tumble polished petrified wood, northern Arizona:  A

polished specimens of petrified wood:  A  B  C  D  E  F  G

Photos are copyright free for non-commercial educational uses. 
Just credit photos to R.Weller/Cochise College.
copyright 2007-R.Weller