squeak1
off to a rocking start
Member since March 2013
Posts: 12
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Post by squeak1 on Mar 30, 2013 4:53:29 GMT -5
I stumbled on a big pile of these and also what may be coral! I appreciate any help! Attachments:
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Post by deb193redux on Mar 30, 2013 10:57:01 GMT -5
you need to get a shot in focus
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jamesp
Cave Dweller 
Member since October 2012
Posts: 36,602
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Post by jamesp on Mar 30, 2013 11:46:22 GMT -5
Was it found in SW Georgia?
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squeak1
off to a rocking start
Member since March 2013
Posts: 12
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Post by squeak1 on Mar 30, 2013 13:18:38 GMT -5
Daniel I found roughly two dumptrack (possibly) dumped by a waterway in Iowa!! This piece is around a foot long and 6 or 8 inches across! I was sniffing around field rock throw off piles one afternoon and while I was looking at this huuge long pile of dumped rock--I started seeing ome peces of this rock with rings in it! Then I really lost it when I realized I was standing on the top of this stuff! It looks like it was at one time in a place where algea was growing on it for years---maybe around a pond or creek. The peices that I cleaned up that don't have lines in it sparkle a bit when I cleaned them up! I got a pick up load of it because I love the looks of it! I been sifting through rock piles most of my life as I am rural in a town f 14 people and a general store! Haaa! I kep wishing I would stumble across something that would be the MOTHERLODE! hAAA apreciate any help and sorry to rant!! I am just ecstatic that I may have a forum to help me figure out what my big pile of rocka might contain!! I got some verry neat rocks!! PEACE
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Post by deb193redux on Mar 30, 2013 13:44:37 GMT -5
OK, Iowa. How about hardness? Does steel nail scratch it? Does piece of agate? It may also be informative if you determined streak, and whether or not it yielded conchoidal fractures.
It would still help a lot to have a picture in focus.
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,718 
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Post by Fossilman on Mar 30, 2013 13:51:39 GMT -5
Without a focus on the pic...I'm going to throw my guess out there and say opalized petwood..........
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squeak1
off to a rocking start
Member since March 2013
Posts: 12
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Post by squeak1 on Mar 30, 2013 19:26:34 GMT -5
Hoping this picture may be better--hope you guys are patient--I am tryin! Attachments:
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Post by deb193redux on Mar 30, 2013 19:35:33 GMT -5
the focus is OK, but the greater distance does mask detail.
the concentric rings do look like wood. but some alteration patterns on softer stones can have rings too. even if softer it could be wood with some other mineral replacement other than Sio2.
any healed radial fractures? like a slice of wood would have?
grit? if opalized wood it will have no grit/grain. other texture? ,,, hardness could still help.
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Post by Pat on Mar 30, 2013 23:11:35 GMT -5
I don't know what it is , but would guess it is a shell of something.
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The Dad_Ohs
fully equipped rock polisher
Take me to your Labradorite!!
Member since September 2012
Posts: 1,860
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Post by The Dad_Ohs on Mar 30, 2013 23:20:44 GMT -5
I'm guessing Pet wood too !!.. maybe from near a swamp ?
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squeak1
off to a rocking start
Member since March 2013
Posts: 12
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Post by squeak1 on Mar 31, 2013 8:43:00 GMT -5
Hoping this is a better pict! Again I am slowly learning how to use a computer and digital camera---as you can undoubtedly tell--so thanks for patience~~ Attachments:
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Post by deb193redux on Mar 31, 2013 10:10:31 GMT -5
still not ready to call it wood. could be a nodular rock of some type that has had several alterations penetrate to various depths.
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agatemaggot
Cave Dweller
Member since August 2006
Posts: 2,195
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Post by agatemaggot on Mar 31, 2013 11:19:06 GMT -5
Might be petrified Algae type thingee. I found a herd of those in a limestone quarry north of Waterloo a few years back. If I remember right, I usually don't, they are called Stroma-something or another. Some appeared like the one you have pictured and some had the appearance of Geodes. They were fairly round and when broken open they displayed concentric lines. Hit one with a squirt of sno-bowl to clean the surface and got a big pile of foam. Appearance did not change at all. Some of the darn things were as large as an apartment size ice box !
Harley
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Post by catmandewe on Mar 31, 2013 12:27:18 GMT -5
Harley, I think you are talking about stromatolites or petrified algea.
Hard to tell from the picture if it is a log shape or a ball shape, we need more pics.
Tony
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Post by jakesrocks on Apr 1, 2013 15:07:01 GMT -5
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Post by deb193redux on Apr 1, 2013 16:21:44 GMT -5
While a stromatolite is a possibility, I think folks are thinking zebra instead of horses. Not saying it ain't, but I'm not seeing it.
Tony had the most astute observation. If it is wood, then it will be a section of log. IF it is an alteration or diffusion fronts within a nodular rock as I speculated, then it is a half nodule or thick slice of a nodule.
Unless it was a very elongated (i.e., log-like) nodule, the pattern on the other side might crucially distinguish log from nodule. IF the pattern has rings about the same size, then it is log-like. If the size of the circles and rings is noticeably different, then it is nodular.
Getting the basic log/nodule question answered and also getting some hardness info would seem the two most important things. Otherwise we are just guessing.
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Mark K
Cave Dweller
Member since April 2012
Posts: 2,816
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Post by Mark K on Apr 1, 2013 20:14:29 GMT -5
The second pic makes me think granite or a relative. I have seen banded granite-like rock here.
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