1
$\begingroup$

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

$\endgroup$

closed as off-topic by Semidiurnal Simon, arkaia, Fred, trond hansen, Jan Doggen Apr 1 at 7:12

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users." – Semidiurnal Simon, arkaia, Fred, trond hansen, Jan Doggen
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ 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
5
$\begingroup$

Your rock is a classic example of chert, one of the most common rocks on the surface of our planet.

$\endgroup$
  • 1
    $\begingroup$ Specifically, I'd call this flint by the colour and texture $\endgroup$ – haresfur Apr 2 at 0:22

Not the answer you're looking for? Browse other questions tagged or ask your own question.