Need some insight

[flintriverrat]

These are stones I found and I have some flint or what I think is flint and these as I broke them open look like it but they don’t have the crystalline look like the other flint I have found is it Chert or just limestone cortex?. The stuff I “know” or believe is flint I will picture below

 

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[flintriverrat]

pottery I’ve found recently as well

 

[joshuaream]

The stuff on the bottom looks like nice coral, if you heat it like modern knappers do it might get very colourful and glassy.

The top stuff looks like lower grade material, it appears to fracture the right way. Do thinner edges hold up or do they crumble away?

 

[flintriverrat]

Thanks for the response josh! They thinner edges in some spots did crumble but some spots they seem fairly strong

 

[flintriverrat]

The last two pics in the first post I have not touched or tried to break open or knapp that’s how I found them forgot to say that in the post