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Desert Rose, concretion, geode?
  
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ilzho




Joined: 31 Jul 2011
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Location: Dallas

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PostPosted: Feb 14, 2017 18:37    Post subject: Desert Rose, concretion, geode?  

Here's one I can't figure out.
I do not know the location of where it was found.
Any help is greatly appreciated.

Thank you,
David



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Bob Harman




Joined: 06 Nov 2015
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PostPosted: Feb 14, 2017 20:42    Post subject: Re: Desert Rose, concretion, geode?  

Most probably a Midwest sedimentary geode from Indiana, Illinois or Kentucky. Most probably found in a creek bed or farm field, hence the name "field or stream geode". These are commonly quartz geodes like this one and the outer surface, which you see, looks like a cauliflower. The fresh hollow examples with secondary minerals are the ones collectors look for.

I suggest looking thru the pages of the thread on Indiana minerals in the area of "A Mineralogical Trip Thru the States of The USA" , specifically looking at the nearly identical examples of unopened geodes in that thread. BOB
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