Color:  Flattop Chalcedony ranges from translucent light to medium gray, to a light brown, pink, blue or lavender with opaque white inclusions, splotches, or mottling.  opaque white to translucent lavender with specks of blue and pink.

Texture:  Fine grain

Luster: Glossy

Translucency:  Translucent

Silica Fabrics / Fossils: Rarely, ostracods may be present

Patina:

Heat Treatment: 

Knapping: Excellent knapping quality

 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Distribution Comments:

Flattop Chalcedony is associated with the Chadron capstone, White River Group and is considered the only high quality material located between central Kansas and Nebraska and into the Rocky Mountain foothills.  Primarily occurs as the capstone for Flattop Butte in the South Platte River drainage of northeastern Colorado.