ashcraft Posted November 2, 2017 Share Posted November 2, 2017 Any ideas? It is made of a black non-magnetic iron mineral. I was thinking a cast of a septarian nodule........ ashcraft, brent allen Link to comment Share on other sites More sharing options...
Herb Posted November 2, 2017 Share Posted November 2, 2017 looks like a marcasite nodule "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
ynot Posted November 2, 2017 Share Posted November 2, 2017 41 minutes ago, ashcraft said: I was thinking a cast of a septarian nodule A septarian nodule is a mineralized mud ball that cracked and the voids were filled with other minerals. You can not have a cast of one of them. I agree with an iron oxide concretion. But the pictures are a bit blurry which makes it hard to be sure. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
ashcraft Posted November 2, 2017 Author Share Posted November 2, 2017 10 hours ago, ynot said: A septarian nodule is a mineralized mud ball that cracked and the voids were filled with other minerals. You can not have a cast of one of them. I agree with an iron oxide concretion. But the pictures are a bit blurry which makes it hard to be sure. You can have a cast of anything. If the nodule was covered with another material, and then through chemical action the original material is replaced, viola-a cast. Is it likely to happen? No, but this is an unusual specimen. The symmetry on multiple axes wants me to say organic.........but my analytical part is saying mineral.........I am so confused........... Brent Ashcraft ashcraft, brent allen Link to comment Share on other sites More sharing options...
abyssunder Posted November 2, 2017 Share Posted November 2, 2017 Looks like a concretion cracked under sediment pressure. A. Seilacher. 2001. Concretion morphologies reflecting diagenetic and epigenetic pathways. Sedimentary Geology 143: 41-57. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
ashcraft Posted November 2, 2017 Author Share Posted November 2, 2017 THAT'S IT! Doing my best Lucy impression, blowing Linus over the piano.......youngsters won't understand Brent Ashcraft ashcraft, brent allen Link to comment Share on other sites More sharing options...
thelivingdead531 Posted November 2, 2017 Share Posted November 2, 2017 Terrible quality, I know, but the only one I could find of the actual moment. Link to comment Share on other sites More sharing options...
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