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Limonite cemented sand?
  
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R Saunders




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PostPosted: Aug 23, 2018 04:20    Post subject: Limonite cemented sand?  

I have several pieces of this from my brother-in-law. His son lives in northwest Kansas and brings them a few each trip. Best description I have found is Limonite cemented sand, concretions? They look like hollow pipes.
I am unable to find much on the web. I would like to know the proper name and how they were formed, age, etc. Thanks, Bob



limonite cemented sand.jpg
 Mineral: limonite
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Kansas, USA
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vic rzonca




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PostPosted: Aug 23, 2018 07:19    Post subject: Re: Limonite cemented sand?  

Show us a shot of the "end grain", Bob, and the size. To be honest, my first thought was a fulgurite. Fused sand from a lighting strike. At the same time I know I'm wrong.
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R Saunders




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PostPosted: Aug 23, 2018 10:11    Post subject: Re: Limonite cemented sand?  

the one shown is 13 inches long. over 30 mm. I will take pictures of the four I have. I did find a article online once a man from England found them. May also be called Indian Pipes? He said they find them digging basements. Heavy!
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R Saunders




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PostPosted: Aug 23, 2018 10:48    Post subject: Re: Limonite cemented sand?  

four pieces given to me. Had a comment that they are also found in Florida?


P1000479.jpg
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P1000479.jpg



P1000480.jpg
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P1000480.jpg



P1000481.jpg
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P1000482.jpg



P1000483.jpg
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Bob Harman




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PostPosted: Aug 23, 2018 11:24    Post subject: Re: Limonite cemented sand?  

Interesting. While the outside of your pieces don't particularly resemble fulgurites, most fulgurites do have a hollow core as your photos appear to show. So I am just not sure.
Also, I would not be surprised to learn that the pieces are man created.......for example broken pieces of old masonry or something like that.
BOB
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vic rzonca




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PostPosted: Aug 23, 2018 11:39    Post subject: Re: Limonite cemented sand?  

Interesting, Bob. Drain tile? Do they look kiln fired? Root casts? Broken stalactite? Do they fit together? Where's that crystal ball?
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Dale Hallmark




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PostPosted: Aug 23, 2018 11:57    Post subject: Re: Limonite cemented sand?  

I have seen these types many times in sand fields in central Texas. They are iron concretions as far as i know. I imagine they concreted around something. I have seen them very large and with fine sand in the middle of a different color than the surrounding sand sometimes bright white but mostly yellow and have seen completely encased round balls with sand in the middle. I think the ones I saw far too large for Fulgurites.

Dale
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crosstimber
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PostPosted: Aug 23, 2018 13:23    Post subject: Re: Limonite cemented sand?  

These are found in several places in Oklahoma as well. Like Dale, I believe they are sand concretions impregnated with iron oxides. I can't give you an explanation of exactly how they form.
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Dale Hallmark




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PostPosted: Aug 23, 2018 15:05    Post subject: Re: Limonite cemented sand?  

In the area i am talking about it is generally Antlers Sand overlain by the Walnut Formation (dirty limestone and claystone).

I believe the iron oxides were leached from the Walnut into the Antlers. I never studied it enough to know for sure. Both are Cretaceous.
Dale
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Rich Loose




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PostPosted: Aug 23, 2018 21:27    Post subject: Re: Limonite cemented sand?  

Could be Callianassa major burrow fossils. The beaded texture in one photo may be a give away. These Cretaceous sand shrimp lined their burrows with fecal pellets. The eroded burrows sometimes look a little like corn cobs. For some reason, iron oxides seem to concentrate in the old fossil tunnels. I have seen many in the Cretaceous sandstone outcrops in northern New Mexico.

Rich
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Dale Hallmark




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PostPosted: Aug 24, 2018 08:46    Post subject: Re: Limonite cemented sand?  

Thar makes entirely too much sense :-)

Dale



Rich Loose wrote:
Could be Callianassa major burrow fossils. The beaded texture in one photo may be a give away. These Cretaceous sand shrimp lined their burrows with fecal pellets. The eroded burrows sometimes look a little like corn cobs. For some reason, iron oxides seem to concentrate in the old fossil tunnels. I have seen many in the Cretaceous sandstone outcrops in northern New Mexico.

Rich
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