Rex Chert
 Phosphoria Chert variant









Natural Form:



Description of Physical Characteristics:

Color: Rex Chert ranges from a brownish red to purple or an ashy gray to black

Texture: Fine grain

Luster: Dull to waxy

Translucency: Opaque

Silica Fabrics / Fossils:

Patina:

Heat Treatment: 

Knapping: 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution:
Distribution Comments:
Rex Chert is associated with the Rex Chert Member of the Phosphoria Limestone Formation of eastern Idaho, northeastern Utah, northwestern Montana, and southwestern Wyoming.  Primary outcroppings occur on Rex Peak of the Crawford Mountains east of Randolph, Rich County, Utah.
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: