Color:  Anvil Ferruginous Chert ranges from a dark gray to a greenish gray or reddish brown.  Dark reddish brown or black inclusion are commonly present.

Texture:  Course granular chert to medium grain oolitic chert or fine grain chalcedonic chert

Luster:

Silica Fabrics / Fossils:

Patina:

Heat Treatment: 

Knapping: 
 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Anvil Ferruginous Chert is associated with the Anvil Ferruginous Chert Member of the Ironwood Iron Formation of Northwestern Michigan.  Primary outcroppings occur at the Old Geneva Mine and Colby Hill in Michigan.  Named for Anvil Mine east of Bessemer, Michigan.