Crystal Summit Obsidian
(Napa Valley Obsidian)










Natural Form:



Description of Physical Characteristics:

Color:  Crystal Summit Obsidian is black with banding and gas voids present.
Texture:

Luster:

Translucency:

Silica Fabrics / Fossils: 
Patina:

Heat Treatment: 

Knapping:  

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution:
Distribution Comments:
Crystal Summit Obsidian is associated with the upper member of the Sonoma Volcanics and occurs as fragments or "chunks" on Crystal Summit, about 1 mile north of Glass Mountain and 1/2 mile northwest of Meg's Crown, Sonoma County, California.
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:
Numerous prehistoric quarries have been located for this obsidian source.
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