O'Leary Peak Obsidian
 AKA: Robinson Crater Obsidian











Natural Form:



Description of Physical Characteristics:

Color:  O'Leary Peak Obsidian is a glassy grayish black highly vitrophyric rhyodacite with abundant phenocrysts.  .
Texture:

Luster:

Translucency:

Silica Fabrics / Fossils: 
Patina:

Heat Treatment:

Knapping:  Poor knapping quality.

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution:
Distribution Comments:
O'Leary Peak Obsidian is associated with the San Francisco Volcanics occurring as nodules between O'Leary Peak and Robinson Crater in Coconino National Forest, Coconino County, Arizona.
Projectile point made from this material:



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References: (See Reference Page, Entry Number):

Similar Material:
Commonly made projectile point from this material:
Archaeological Context:
Artifacts have been reported from this material in the Sunset Crater area.
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