I found this chunk of obsidian, a glass-like volcanic stone, embedded in this stone and mortar wall near Heritage Square in downtown Flagstaff. Only in Flagstaff, a city located in the center of a volcanic field, would a chuck of obsidian, a relatively rare type of stone, be used for such a plain purpose. Thursday, November 29, 2007
Obsidian
I found this chunk of obsidian, a glass-like volcanic stone, embedded in this stone and mortar wall near Heritage Square in downtown Flagstaff. Only in Flagstaff, a city located in the center of a volcanic field, would a chuck of obsidian, a relatively rare type of stone, be used for such a plain purpose. 
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Also in Newberry Oregon you will find this. The big obsidian flow is a rather large area full of it.
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