ZinzinToons

It appears to be a smooth river or beach pebble.
The dark gray rock contains several lighter inclusions.
The large white oval patch looks like it could be a quartz-filled cavity, a fossil fragment, or a mineral inclusion.
The small spiral-shaped feature near the bottom of the white patch resembles part of a shell or fossil, though a close-up inspection would be needed to confirm that.
If you're trying to determine whether it's a fossil, gemstone, or unusual rock, please upload:
Photos of both sides.
A closer, sharper photo of the white spiral area.
The location where you found it (river, beach, mountain, etc.).
With those details, I can give a more informed identification

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