It think is an Agate but not sure what kind of it is. As best as I can tell under the orange its really pretty.

It is 21 lb. I found it at a rest stop out side of Yakima, WA, USA.
But it does not look like anything I've found in that area before.

Found this at a rest stop and it looked really specialfrom what i can tell its a huge Agate maybe... if so what kind?enter image description herethis is a piece I broke off

  • $\begingroup$ Hello, welcome. if possible, give us some of the info listed in this post earthscience.meta.stackexchange.com/questions/124/… $\endgroup$ – Universal_learner Aug 7 '18 at 8:11
  • $\begingroup$ Are you sure it wasn't Vantage on I-90, not Yakima? The reason I ask is that it looks in the pictures that it could be petrified wood like you can see at Ginkho Petrified Forest, just north of Vantage. $\endgroup$ – haresfur Aug 7 '18 at 22:31
  • $\begingroup$ 100% and you think so? I have a couple big chunks of petrified wood and none of them look like this one. I did find a smaller not related to this question that im trying to figure out and that thought has run through my head with it.. I think it might be opal in the wood... Hmmm i wish my phone had a better camera so i could show more detail. Dang it. $\endgroup$ – Julian A Kersey Aug 8 '18 at 14:30
  • $\begingroup$ I think im going to take it to the rock hounding club we have here in town and see what they think... Thank you for the help and one way or another we'll figure this out. Ha ha $\endgroup$ – Julian A Kersey Aug 8 '18 at 14:35

Your rock is most likely a piece of petrified wood where the wood has been replaced by chalcedony, a microcrystalline form of quartz. Your rock could be classified as agate based on its appearance and translucency.


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