I don't have any clue what it is...
https://lh3.googleusercontent.com/-3cy28rZ8ENE/X_2y1FugIzI/AAAAAAAAHhw/yRmPzQACbrI8p1bXGNOCnEd1XFTREufHACK8BGAsYHg/s0/2021-01-12.jpg
That's a pic.
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Cool rock! It looks igneous (made from cooled lava) or metamorphic (exposed to extreme heat but not melted). I'm sorry but I am not a geologist. I can't tell you anything exact. :(