Just found

This is one piece I've turned twice to show more in the pic[You must be registered and logged in to see this image.]
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More of the same piece turned at different angles. [You must be registered and logged in to see this image.]
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More of same piece different angles. [You must be registered and logged in to see this image.]
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Any idea what kind of rock this is? It almost looks like it has a separate shell like it was coated in clay and fired.

I have no idea. There is an app that identities Rick I might try

The interpreted profile in first picture kind of reminds me of the recent drawings of homo naledi I've seen.