EchoBravo Posted February 3, 2017 Share Posted February 3, 2017 (edited) I found what I thought was originally a giant superior agate. After cutting it and didn't see any fortification I labeled it common Chalcedony. Then I read an article about Coprolites in my Rock & Gem mag. and they had a carving that looked exactly like the inside of my.. what I thought was chalcedony. Being more of a rock guy than a fossil guy I thought I would try and get some expert advice on its identification. Here is why I think it might be coprolite. 1. superior agates are formed inside of basalt cavities and weathered out which leaves impressions on the outside.. (none I could find that looked like other agates) 2. there looks to be insect burrow holes like something may have bored in at one time and after it mineralized left a bit of druzy quartz in the burrow holes. (can only see with eye piece) 3. there is a slight flat spot like it had been sitting for some time undisturbed prior to mineralization. These were some of the things I read in the article that had me second guessing what I had found. I found the piece along a lake bank that had eroded a bit due to receding ice. This is in Buffalo, (Wright County) Minnesota. Thanks. one pic is whole, the rest I cut in half and polished one side to try and enhance the view on the inside. Edited February 3, 2017 by EchoBravo typos Link to comment Share on other sites More sharing options...
EchoBravo Posted February 3, 2017 Author Share Posted February 3, 2017 Not sure if it helps in the fossil world but the material had a hardness of 7 on the MOHs scale. Used a scratch test kit to identify hardness. Thanks. Link to comment Share on other sites More sharing options...
ynot Posted February 3, 2017 Share Posted February 3, 2017 Looks like a typical agate to Me. 1 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...
GeschWhat Posted February 3, 2017 Share Posted February 3, 2017 Sadly, I'm 99.5% sure it is not coprolite. Many of the siliceous rocks that show up online (usually from Utah) as coprolites are most likely not coprolites at all. Unless there are visible bone inclusion, they are found in direct association with a fossilized skeleton, or contain backfilled insect burrows, there is no way to know for sure. I have yet to find or see a Minnesota coprolite, but am always on the look-out. Keep looking! 1 Lori www.areallycrappystory.com/fossils www.facebook.com/fossilpoo Link to comment Share on other sites More sharing options...
fifbrindacier Posted February 4, 2017 Share Posted February 4, 2017 I also do not see coprolite here, sorry. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
EchoBravo Posted February 4, 2017 Author Share Posted February 4, 2017 (edited) Thank you for your responses.. Edited February 4, 2017 by EchoBravo Link to comment Share on other sites More sharing options...
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