fngonuts Posted January 19, 2008 Share Posted January 19, 2008 I found this near a coal mine. Any Guesses? Well other than a human brain. The last 2 pictures are of the inside. It has a thin layer of some sort of black crystals on the inside that formed in the cracks and crevices. Link to comment Share on other sites More sharing options...
Mike Owens Posted January 19, 2008 Share Posted January 19, 2008 It's a geode. -----"Your Texas Connection!"------ Fossils: Windows to the past Link to comment Share on other sites More sharing options...
ebrocklds Posted January 19, 2008 Share Posted January 19, 2008 try googling "septarian nodule" these are mineral concretions that for a wide variety of cracked patterns inside of round "mud balls" i have even found some with ammonites inside along with the crystals. brock Link to comment Share on other sites More sharing options...
MOROPUS Posted January 19, 2008 Share Posted January 19, 2008 try googling "septarian nodule" these are mineral concretions that for a wide variety of cracked patterns inside of round "mud balls" i have even found some with ammonites inside along with the crystals.brock I agree with you; I`ve even got one with part of a crystalized Hoploparia lobster from the Upper Cretaceous of northen Spain! Link to comment Share on other sites More sharing options...
fngonuts Posted January 19, 2008 Author Share Posted January 19, 2008 thanks guys thats what I figured it was Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted January 20, 2008 Share Posted January 20, 2008 To me, they also look like geodes that have undergone a final episode of Manganese precipatation. Do they have a chalcedony rind? What is the age of the rocks where they were found? Link to comment Share on other sites More sharing options...
fngonuts Posted January 21, 2008 Author Share Posted January 21, 2008 no there is no rind. As far as the age goes all I can do is guess. Everything I find has been removed from the ground long ago because it was in the way of the Coal. If I had to guess I would say Pennsylvanian or Mississipian based on the fern fossils and trees I have found. Link to comment Share on other sites More sharing options...
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