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Fluorescent Septarian Nodule

 
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Smokedaddy



Joined: 07 Oct 2006
Posts: 1685
Location: Phoenix, Arizona

PostPosted: Tue Apr 07, 2020 3:56 pm    Post subject: Fluorescent Septarian Nodule Reply with quote

Septarian nodule specimens are found in Utah approximately 20 to 40 feet below the surface. Septarians were formed 50 to 70 million years ago when The Gulf of Mexico extended up to what is now the Central United States. So decomposing shell and sea life on the ocean floor had a chemical attraction for the sediment around them, forming concretions (a compact mass of matter). As the oceans receded, the rolling action of the waves resulted in the formation of nodules, that were eventually buried in the mud. As the balls dried and cracked , mineralized solutions, carried by ground water, were deposited into the cracks forming aragonite and golden yellow calcite. The gray mineral is fossilized mud or limestone. I'll post an image later showing what it looks like not exposed to UV light.

I haven't photographed fluorescent minerals before. This was shot with two longwave UV lights (wavelength of 320 nm) and my old Panasonic GH3. I thought it turned out well considering my lack of experience shooting in UV. I thought the patterns were very interesting. The illumination on the right was intentional (or lack of).

A larger version is here;

https://squattingdog.smugmug.com/My-First-Gallery/i-R9KGxdn/A



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jpringle



Joined: 26 Jan 2020
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PostPosted: Tue Apr 07, 2020 5:16 pm    Post subject: nodule Reply with quote

Nice specimen, and it looks like your technique worked quite well. Never heard of these. Thanks for sharing. Jamie
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Saul



Joined: 31 Jan 2011
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Location: Naperville, IL USA

PostPosted: Tue Apr 07, 2020 7:11 pm    Post subject: Reply with quote

James, very impressive ! Never seen before.
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Saul
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Sumguy01



Joined: 28 Jan 2013
Posts: 1498
Location: Ketchikan Alaska USA

PostPosted: Tue Apr 07, 2020 8:31 pm    Post subject: Reply with quote

Applause Very interesting and very nice.
Thanks for sharing.
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Macro_Cosmos



Joined: 15 Jan 2018
Posts: 633
Location: Sydney

PostPosted: Wed Apr 08, 2020 3:22 am    Post subject: Reply with quote

Those colour are lovely. Great work.
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Smokedaddy



Joined: 07 Oct 2006
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Location: Phoenix, Arizona

PostPosted: Thu Apr 09, 2020 9:51 am    Post subject: Reply with quote

I read about fluorescent minerals years ago but never considered photographing one. I like the cut and polished ones better from a photographed perspective.
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Lou Jost



Joined: 04 Sep 2015
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Location: Ecuador

PostPosted: Thu Apr 09, 2020 11:09 am    Post subject: Reply with quote

Very beautiful, and with an interesting story behind it. Did you have to use a UV filter on your lens?
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Smokedaddy



Joined: 07 Oct 2006
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Location: Phoenix, Arizona

PostPosted: Thu Apr 09, 2020 11:19 am    Post subject: Reply with quote

Lou Jost wrote:
Very beautiful, and with an interesting story behind it. Did you have to use a UV filter on your lens?


Thanks LJ ... no, I didn't even attempt it. I would love to find an affordable shortwave UV light because SOME (not all) fluorescent minerals illuminate totally different with SW UV. I was told by the rock hounds that Midnight Minerals, or Engenious Designs (thats how they spell it) are the best sources for SW lights but they are way out of my price range.
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Smokedaddy



Joined: 07 Oct 2006
Posts: 1685
Location: Phoenix, Arizona

PostPosted: Thu Apr 09, 2020 11:01 pm    Post subject: Reply with quote

Here is another. I have two different ones, both are polished. A larger image link is below. Not sure that I like the lighting on this shot.

https://photos.smugmug.com/My-First-Gallery/i-ckTPxc8/1/d293077a/X3/4%20SMUG%20-r-%20DSC_1165-X3.jpg



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