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Today I found a strange rock. I thik it can have a fossil, but I'm not sure. It looks like granite with worm-like "fossil". Can You help me?
I think it is a piece of quartzite, or quartz-rich sandstone, with a burrow (trace fossil).
It is too irregular, and lacks some particular features, to be a crinoid stem (to mention something else that is tubular in shape).
If you are not familiar with trace fossils, there's a lot to learn; try here.
I agree with Mike, nice find Rambo.