Trinity Obsidian











Natural Form:



Description of Physical Characteristics:

Color:  Trinity Obsidian is black with minor inclusions.  Phenocysts may appear elongated with banding common.
Texture: Fine grain

Luster: Ranges from a "greasy" appearance to vitreous

Translucency: Semi-translucent with a gray color with a golden brown tint being produced.

Silica Fabrics / Fossils: 
Patina:

Heat Treatment: 

Knapping:  

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution:
Distribution Comments:
Trinity Obsidian is associated with the lower member of the Sonoma Volcanics and occurs as nodules along the Alabazas Creek - Trinity Road at an elevation of about 400 feet east of Highway 12, east Sonoma Valley, 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:
No quarries have been located for this obsidian, but has been found in archeological sites in the local area.
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