Pitchstone Photos                     

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



last edited:  11/15/16    number of photos:  13                                                          
Pitchstone is a volcanic glass that has a duller surface than
regular obsidian. 
In some cases, it is an obsidian that has started to devitrify. 
The surface also has a broken-up texture.


pitchstone, black:  1  2  3  4  5  6  7  8
pitchstone, brown:  1  2  3
pitchstone from California:  1 

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