Black Rock Obsidian
 AKA: Coyote Hills, Cove Fort, Cruz, Fillmore, South Twin Peak, Tabernacle, White Mountain Obsidian











Natural Form:



Description of Physical Characteristics:

Color: Black Rock Obsidian ranges from a dark gray to black with phenocyst (snowflak obsidian) and reddish brown streaking (mahogany obsidian) commonly present.
Texture:

Luster:

Translucency:

Silica Fabrics / Fossils:

Patina:

Heat Treatment: 

Knapping: 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution:
Distribution Comments:
Black Rock Obsidian occurs around Black Rock, Coyote Hills, South Twin Peak, and White mountain in Millard County, Utah  Occurrences at Cove Fort, Cruz, Fillmore, and Tabernacle are the same goechemical group.  Obsidian field occurs from Milford to Clear Lake (west of Delta) to Fillmore and Cove Fort.
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: