2
$\begingroup$

enter image description hereenter image description here

I found this on the bank of the Fraser River in BC, and at first I thought it was a piece of wood. But when I picked it up, I realized it wasn’t. Does anyone know what formed the rings? Is it even a rock?

$\endgroup$
  • 1
    $\begingroup$ Please read this post for rock identification posts. $\endgroup$ – Eevee Feb 22 '18 at 2:07
  • 1
    $\begingroup$ can we see the other side of it? $\endgroup$ – John Feb 22 '18 at 20:28
2
$\begingroup$

It is a rock showing color bands of iron oxide. The color banding is most likely the result of moisture penetrating the rock and causing the iron to go into solution and migrate. This process produces the color bands present in the rock.

This commonly seen in sandstone formations containing iron bearing minerals. Here is an article that does a nice job illustrating how water causes iron staining. Although your rock does not appear to be sandstone, the same process applies to igneous or metamorphic rocks.

Source: https://blogs.agu.org/mountainbeltway/2015/08/19/iron-oxide-sweat-stains-in-sandstone/

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

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