Color: Gray to grayish black, flow banding may be present alternating from light to darker gray

Texture: Very fine grain, but occurs in all textures from fine to course.
 
Luster: Dull

Silica Fabrics / Fossils: Fossils are absent

Patina: Chalky white

Heat Treatment: 

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Rhyolite is associated with volcanic activity and found throughout North America.   Rhyolite is a type of solidified volcanic ash or also called tuff.  Primarily used for projectile points in the eastern United States even though outcroppings are more common in the western region.