brus Posted July 25, 2016 Share Posted July 25, 2016 hi,could this be stromatolite? Link to comment Share on other sites More sharing options...
Guguita2104 Posted July 25, 2016 Share Posted July 25, 2016 Hi! Yes, I think so. However let's wait for the experts' opinion. Regards, Link to comment Share on other sites More sharing options...
ashcraft Posted July 25, 2016 Share Posted July 25, 2016 Don't know...........layers are a bit far apart compared to what I normally find around here. Brent Ashcraft ashcraft, brent allen Link to comment Share on other sites More sharing options...
Fletcher Posted July 26, 2016 Share Posted July 26, 2016 I'm curious - how often do stromatolites have crystalline banding like that? I've never seen one like that but I am very new at this. My first thought was that it's an agate, but while agates can be found near Lepoglava I'm not sure what sorts of characteristics they can have... Link to comment Share on other sites More sharing options...
Fletcher Posted July 26, 2016 Share Posted July 26, 2016 Unless I'm looking at it wrong and those aren't crystals I'm seeing in there, which is somewhat likely. Link to comment Share on other sites More sharing options...
ynot Posted July 26, 2016 Share Posted July 26, 2016 Do not know about the polished piece, but the large chunk looks like a banded agate to Me. I do not see what I would expect from stromatolite. Tony 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 July 26, 2016 Share Posted July 26, 2016 Stromatolite generally preserve in two ways. Carbonate (limestone/dolomite), which form by precipitation of the carbonate by localized pH changes caused by photosynthesis. The other way is when debris (sand) gets caught in the slime layer. These particles eventually fuse and form flint/chert. My first thought when I saw your specimen was agate, but I am not a mineral guy. Agates are VERY similar to chert stromatolites. Brent Ashcraft ashcraft, brent allen Link to comment Share on other sites More sharing options...
ynot Posted July 26, 2016 Share Posted July 26, 2016 Stromatolite generally preserve in two ways. Carbonate (limestone/dolomite), which form by precipitation of the carbonate by localized pH changes caused by photosynthesis. The other way is when debris (sand) gets caught in the slime layer. These particles eventually fuse and form flint/chert. My first thought when I saw your specimen was agate, but I am not a mineral guy. Agates are VERY similar to chert stromatolites. Brent Ashcraft They can also be agatized, as what is found in the Yellowstone river. Tony 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...
howard_l Posted July 26, 2016 Share Posted July 26, 2016 Looks like cave formed Travertine, if it is soft, if it scratches glass, travertine Silica replaced. Howard_L http://triloman.wix.com/kentucky-fossils Link to comment Share on other sites More sharing options...
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