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It’s yellow and grey on the outside but smooth and black on the inside. Very roughly 2.27 g/ml

Just curious, it almost like sea glass on the inside but it’s far too dense.

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closed as off-topic by Leukocyte, arkaia, trond hansen, Jan Doggen, Peter Jansson Jul 12 at 12:27

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This is flint. The conchoidal fracture, the wax-like or glassy interior and the 'crust' in a lighter color is typical for flint. Usually, flint has a density of around 2.6, which also fits well with the value you mentioned.

Further information can be found here

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