gravelgrazer
noticing nice landscape pebbles
Member since June 2012
Posts: 76
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Post by gravelgrazer on Nov 2, 2012 1:43:00 GMT -5
<iframe src="https://skydrive.live.com/embed?cid=6AF387FBD8F39DF5&resid=6AF387FBD8F39DF5%21980&authkey=ABhMmg4Wf_axYmg" width="319" height="178" frameborder="0" scrolling="no"></iframe>[/img]Hi I am curious about this one from E.Central Oregon. The smaller end has a blue tint to it from the inside. What's with the green outter layer? Thanks for your help!! Attachments:
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,685
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Post by Fossilman on Nov 2, 2012 12:05:50 GMT -5
Looks like agatized coral to me,but could be limb cast too.........Pretty close on both variations. Very nice piece too,I like it!
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rockingthenorth
fully equipped rock polisher
Member since January 2012
Posts: 1,637
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Post by rockingthenorth on Nov 2, 2012 13:17:56 GMT -5
love the color..very cool
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Post by gingerkid on Nov 5, 2012 10:11:55 GMT -5
Not sure what it is called, but it's beautiful. Looks like it has some killer bytroidal-action.
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hand2mouthmining
spending too much on rocks
Purveyors of California Gem Rock
Member since September 2011
Posts: 495
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Post by hand2mouthmining on Nov 6, 2012 14:16:42 GMT -5
I'm with the Fossilman, looks like agatized coral, or at least coral as the cast material. If coral, it would've been deposited through infiltration of hot, acidic, silica laden water over untold years. The acidic water would have eroded the calcium carbonate of the coral, dropping silica to create agate. The clearer nature usually indicates a higher water acidity and temperature. It's a really pretty specimen! Kris
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gravelgrazer
noticing nice landscape pebbles
Member since June 2012
Posts: 76
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Post by gravelgrazer on Nov 8, 2012 1:07:14 GMT -5
Thanks for all the info, I really appreciate it!
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elementary
fully equipped rock polisher
Member since February 2006
Posts: 1,077
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Post by elementary on Nov 10, 2012 12:05:23 GMT -5
Showing a picture from the end as that might provide another point of view.
I know Oregon has several famous places where limbcasts can be found, and it also has locations where green petrified wood is also encountered.
Fun piece! Keep hunting.
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rockhound97058
freely admits to licking rocks
Thundereggs - Oregons Official State Rock!
Member since January 2006
Posts: 760
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Post by rockhound97058 on Nov 13, 2012 0:24:38 GMT -5
Interesting piece... I know it's not a limb cast or at least doesn't look anything like the many I have dug and seen, and I cannot honestly say I have heard of fossilized coral coming from Oregon. To me it looks like many of the nodules we collect from the basaltic flows around our state. This type of texture is fairly common with the nodules...and the coloring could be from various minerals in the ground. In the Ashwood, Oregon area we get many like this, small yet the same reverse 'warty' appearance, and many are very dark green :-)
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gravelgrazer
noticing nice landscape pebbles
Member since June 2012
Posts: 76
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Post by gravelgrazer on Nov 24, 2012 23:01:23 GMT -5
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Post by catmandewe on Nov 25, 2012 11:09:23 GMT -5
I agree with Jason, I think it is a nodule that has worn out of the host rock.
Tony
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