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About 9 years ago I found this rock in the middle of the river. It reminds me of a some kind of a volcanic rock, but I live in Finland, and we only have dead volcanoes around here. Outer layer is just a normal looking rock with tiny little craters, and in the inside it reminds me little bit like obsidian, but with lighter color. It's hard and maybe as dense as a normal rock of that size. Also it doesn't appear to be magnetic. https://imgur.com/a/g7Y5Lmd enter image description here enter image description here enter image description here

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  • $\begingroup$ Those pics have too little and uneven lighting. Please follow the instructions from the rock ID guide. $\endgroup$ – Jan Doggen Apr 1 at 7:12
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Your rock is a classic example of chert, one of the most common rocks on the surface of our planet.

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    $\begingroup$ Specifically, I'd call this flint by the colour and texture $\endgroup$ – haresfur Apr 2 at 0:22

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