SteveHolmes
fully equipped rock polisher
Member since July 2009
Posts: 1,900
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Post by SteveHolmes on Dec 9, 2012 13:59:17 GMT -5
Picked up a small assortment of rocks and minerals yesterday and this was hidden in the bottom of one of the boxes. Most of the material is labeled the from the 70's and from Arizona or New Mexico...so I'm assuming this is where this Geode is most likely from. It's quite large and full of crystals. It weighs 8lbs 6 oz and is 8.5" x 6" and is 5" deep. Any help would be appreciated....and it's for sale. steve
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elementary
fully equipped rock polisher
Member since February 2006
Posts: 1,077
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Post by elementary on Dec 9, 2012 16:06:53 GMT -5
This looks to be more Keokuk (or other midwest variety) in type than Arizona. Most of the Arizona locations that produce geodes are more of the thunderegg type - like those by Kofa(I think that's the name) or Brenda. They have that rhyolitic shell. Your exterior has that coral head look that many Keokuks have, and these can get quite large as well, which your specimen certainly fits. Look them up to compare. A random site I just found is called "First Crack Geodes" try there. firstcrackgeodes.ipower.com/index.htmlBut then again, what do I know? I'm just a misunderstood rock expert according to my ID. Lowell
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,456
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Post by Sabre52 on Dec 9, 2012 17:50:08 GMT -5
Yup. I'd agree with Lowell. Keokuk sedimentary Warsaw formation type like those found in several midwestern states among them, Iowa, Tennessee. Kentucky, Missouri. Those little thumbprint formations in the shell are pretty typical . Some look almost like psuedomorphs after crinoid heads or coral heads...Mel
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SteveHolmes
fully equipped rock polisher
Member since July 2009
Posts: 1,900
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Post by SteveHolmes on Dec 9, 2012 18:32:17 GMT -5
Thanks you guys! I was honestly thinking Keokuk myself from first looking at it. I just assumed possibly the other locations...but I would have to agree with 2 of the most informative folks on the board. Steve
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Post by tandl on Dec 11, 2012 10:36:10 GMT -5
Looks to be a Kentucky , with the red clay on the shell and the look of the interior and staining . Keokuks are usually lighter gray /whitish with cleaner interior . And i must add that alot of keokuks are found on the illinois side of the Mississippi River in the banks and tributary creeks . I personally find geodes clear across the state in far Eastern Illinois , some are agates when cut . Geodes are also found in Indiana ....
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