Franz Valley Obsidian











Natural Form:



Description of Physical Characteristics:

Color:  Franz Valley Obsidian ranges from a banded black to a unique greenish brown color or a "battleship" gray color.
Texture: Fine grain

Luster:

Translucency:

Silica Fabrics / Fossils: 
Patina:

Heat Treatment: 

Knapping:  

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution:
Distribution Comments:
Franz Valley Obsidian occurs in the Franz Valley of the North Coastal Ranges, Napa County, California.  Primary outcroppings occur on the east slope of Devils Kitchen overlooking the Franz Valley and on the Napa and Sonoma County line near Franz Valley School Road.
Projectile point made from this material:



Pictures Provided By:
Do you see information that is incorrect on this page, or do you have information that should be added?  If so, please:

Send Us A Message
or e-mail pictures and information to
Material@Projectilepoints.net


Do you see information that is incorrect on this page, or do you have information that should be added?  If so, please:

Send Us A Message
or e-mail
Questions@Projectilepoints.net


References: (See Reference Page, Entry Number):

Similar Material:
Commonly made projectile point from this material:
Archaeological Context:
Many prehistoric quarries have been located in the Franz Valley and artifacts has been found at sites.  Franz Valley Obsidian has a unique trace element signature with barium concentrations exceeding 600 PPM.
.