Florida
One of the variations of chert in FL is Greasy Agate. Looks like vaseline is coating the material. I am not sure if it is naturally occurring as "greasy" or if it's an effect from heat treating.
photos and information courtesy of tomclark
One of the variations of chert in FL is Greasy Agate. Looks like vaseline is coating the material. I am not sure if it is naturally occurring as "greasy" or if it's an effect from heat treating.
photos and information courtesy of tomclark