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Dragon Stone / Septarian Concretion
  
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Airborn406




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PostPosted: Aug 11, 2022 21:40    Post subject: Dragon Stone / Septarian Concretion  

I was wondering if anyone has ever seen a Septarian Concretion that is this large before?
I purchased this stone from a co worker a couple years ago, her husband had found it near a lake in our area while digging a driveway for a new home construction.

This stone is nearly two foot long and a foot wide and weighs 130.30 pounds.

Sits at the end of my waterfall as a conservative piece.



E97C02F7-F735-4E8C-8AA8-1039F1B54377.jpeg
 Mineral: Quartz
 Description:
More of my favorite stones.
 Viewed:  957 Time(s)

E97C02F7-F735-4E8C-8AA8-1039F1B54377.jpeg


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Airborn406




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PostPosted: Aug 11, 2022 21:50    Post subject: Re: Dragon Stone / Septarian Concretion  

Here are a couple of my favorite sandstone finds also.


2595A66F-9AA0-46E3-B47C-461B04EF815A.jpeg
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James Catmur
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PostPosted: Aug 12, 2022 04:33    Post subject: Re: Dragon Stone / Septarian Concretion  

I largest I ever found was about 1m long. I have no idea how much it weighed as we broke it up looking for crystals (but it took three of us to move it)

Airborn406 wrote:
I was wondering if anyone has ever seen a Septarian Concretion that is this large before?
I purchased this stone from a co worker a couple years ago, her husband had found it near a lake in our area while digging a driveway for a new home construction.

This stone is nearly two foot long and a foot wide and weighs 130.30 pounds.

Sits at the end of my waterfall as a conservative piece.
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Airborn406




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PostPosted: Aug 12, 2022 06:03    Post subject: Re: Dragon Stone / Septarian Concretion  

Wow, that is big!
Where was it found?
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James Catmur
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PostPosted: Aug 12, 2022 11:45    Post subject: Re: Dragon Stone / Septarian Concretion  

Spain - some of them are far bigger but need a digger to extract

Airborn406 wrote:
Wow, that is big!
Where was it found?
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Pete Richards
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PostPosted: Aug 13, 2022 06:56    Post subject: Re: Dragon Stone / Septarian Concretion  

In certain middle Paleozoic shales in Ohio, septarian concretions are abundant and reach 2 meters in diameter. They are mineralized with dolomite of several generations, quartz, lesser barite, occasional calcite and whewellite, and uncommon apatite, sphalerite, aragonite, pyrite, and marcasite. Some of these form very nice crystals and fascinating microcrystals, such as elongated, right-angle-bent pyrite crystals.


Septaria 4.JPG
 Description:
relatively small concretions
 Viewed:  696 Time(s)

Septaria 4.JPG



Septaria 5.jpg
 Description:
concretion as yard ornament
 Viewed:  696 Time(s)

Septaria 5.jpg



PM1.jpg
 Mineral: Pyrite
 Description:
Huron River near Milan, Ohio
<1 mm, see scale bar in image
 Viewed:  694 Time(s)

PM1.jpg



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James Catmur
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PostPosted: Aug 13, 2022 07:05    Post subject: Re: Dragon Stone / Septarian Concretion  

I also used to collect smaller (up to 30cm) ironstone ones in Fife, Scotland. They sometimes contained crystals of calcite, dolomite and marcasite
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Pete Richards
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PostPosted: Aug 13, 2022 07:19    Post subject: Re: Dragon Stone / Septarian Concretion  

Airborn406 wrote:
I was wondering if anyone has ever seen a Septarian Concretion that is this large before?


Now that I look at this picture again, I think that this is not a septarian concretion after all. I think it is a portion of a sedimentary layer with mineralized mud cracks.

The difference is that this is a sedimentary bed feature, a planar structure which might have extended for many meters in the directions of the bedding, but only is a few centimeters thick. The cracks are mostly vertical, and intersect in crude polygons, usually approximately hexagonal.

Septarian concretions, and concretions in general, typically form around a center within a body of sediment, so they usually are subspherical in shape, somewhat thinner in the vertical direction than laterally. The septarian cracks are typically interior to the concretion, and radiate outward from the center (more or less), not reaching the surface except where weathering and alteration of the material composing the concretion (usually carbonates of iron and calcium) have exposed them.

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