What is it?

[LilLucky]

Found in Oregon

 

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[Older The Better]

Obsidian, but I don’t see volcanic rocks where I live so I can’t help beyond that, I suspect being banded it has a more specific name.

 

[ToddsPoint]

I think they call that one rainbow obsidian. Gary

 

[unclemac]

Oregon has a lot of obsidian. If you found this piece out in the wild and all alone where it has no business being than it could well be a piece that was transported and traded by native peoples. You may want to look around for artifacts or a camp site close by.