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I believe this an ammonite chamber.
Is this gold inside or something else?
This was found Folkestone Kent.
Thank you for looking.
More likely pyrite. I have two small pyritized ammonites from Lyme Regis. Yours looks better.
Thank you very much.
I concur: almost certainly pyrite.
Your specimen shows the wavy shape of the septa (the walls that divide the camerae (chambers)) nicely.
Yes Mike is correct!
Well done Mike.