Help identifying rock from oregon?

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Offline austinl

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Help identifying rock from oregon?
« on: 06/07/2010 22:12:54 »
Found this rock on a trip to Oregon in a river. I polished it after i found it.
http://www.flickr.com/photos/51886910@N08/

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Offline RD

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Help identifying rock from oregon?
« Reply #1 on: 06/07/2010 22:30:12 »
Similar to onyx ? ...

[attachment=12406]
http://www.flickr.com/photos/51886910@N08/                   http://en.wikipedia.org/wiki/Onyx
« Last Edit: 06/07/2010 22:36:12 by RD »

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Offline Bass

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Help identifying rock from oregon?
« Reply #2 on: 07/07/2010 00:04:20 »
2nd picture (back) looks suspiciously like obsidian (volcanic glass).  If not, then it is some form of cryptocrystalline (extremely fine-grained) quartz- opal, chert, chalcedony, flint, etc.
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Offline austinl

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Help identifying rock from oregon?
« Reply #3 on: 07/07/2010 01:19:06 »
Your saying it could be green obsidian? i found it in the Russian river not near crater lake.

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Offline frethack

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Help identifying rock from oregon?
« Reply #4 on: 07/07/2010 14:36:58 »
Your saying it could be green obsidian? i found it in the Russian river not near crater lake.

Rivers carry loads of material depending on the bedrock/sediments that the flow over/through.  This piece obviously hasnt travelled far, or it would be better rounded.  I think Bass is right...it looks like it could be obsidian.
frethack

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Offline Karen W.

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Help identifying rock from oregon?
« Reply #5 on: 08/07/2010 07:41:33 »
Found this rock on a trip to Oregon in a river. I polished it after i found it.
http://www.flickr.com/photos/51886910@N08/
I agree with Bass looks like obsidian to me also... By The way! I love the Russian River... we spent loads of time on that river as kids with my Mom and Grandma...picnicking etc.. It's lovely isn't it?

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