Color: Warsaw Chert is opaque and ranges from a pale tan or brownish gray to a medium brown,  White streaking is commonly present along with white fossil remnants.  A variation is a higher quality chert ranging from a homogenous bluish white to a very pale gray 

Texture: Fine grain

Luster: Glossy

Silica Fabrics / Fossils: Sponge spicule

Patina:

Heat Treatment:  Heat treatment produces pinkish hues, blue hues, or a smoky medium bluish gray color.  The higher quality homogenous chert has greater opacity and turns white.  Fossil fragments turn red.

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Primary outcroppings are found along the upper South Skunk River valley, Iowa.  Has been reported in n Jefferson, Henry, Louisa, and Van Buren Counties, Iowa