When reefs get "fossilized", agatized , parts of it become Baybottom chert which shows the fossils within the stone, similar to coral. Coming from the water and being under water for a long time this material is almost always has a dark patina, often black and brown.
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"Baybottom" Chert FL
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Tom - would this be similar to the point you posted a week or so ago, that had a snowflake pattern fossilized on it's surface??Pickett/Fentress County, Tn - Any day on this side of the grass is a good day. -Chuck-
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Yes it's the same geologic/chemical process of replacement of the organisms' structures with cryptocrystalline quartz: chalcedony/Agate, even chert. In the case of coral, neat specimens of coral polyps. In baybottom, all kinds of organisms, mainly shell but sometimes there are also a few coral polyps in with the mix of other animals. Both materials will patinate the same to white in sand/dry and in water will take on colors of the river patina. But that frosting patina was almost unique!
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This has defiantly prompted me to search for a new mineral book about my area .
I need to get to this point . I have always collected rocks since I was a little girl . When I find a point I seem to be looking up or at the material ( lithic) more then the ID
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