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Chalcedony geode with horned Coral in center


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Susan Slater

Hi, about 30 years ago I stopped at a rock shop in Colorado. I was allowed to pick 4 geodes for a certain price. When they opened this chalcedony geode there was a horned coral in the middle with one crystal on the top of the horned coral. They tried to buy it back from me right away but I said no way! 

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Ludwigia

Is it possible to post sharper photos? I can't quite make it out.

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FossilDAWG

I also don't see it.

 

Don

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Susan Slater
33 minutes ago, Ludwigia said:

Is it possible to post sharper photos? I can't quite make it out.

Yes I will try to get a better pics and send them.

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Susan Slater
20 hours ago, Susan Slater said:

Yes I will try to get a better pics and send them.

Here are two more pics let me know if it’s better.F8DE9161-3D58-4707-B007-B552FC0CC63F.thumb.jpeg.c9302b33d3d3593948a56521d1c1e28a.jpegF8DE9161-3D58-4707-B007-B552FC0CC63F.thumb.jpeg.c9302b33d3d3593948a56521d1c1e28a.jpeg

CA629291-B423-4E91-9B44-25AFE5ACCA43.jpeg

74577D1D-E607-432F-B30F-CC766C88EECB.jpeg

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Susan Slater
12 minutes ago, Susan Slater said:

Here are two more pics let me know if it’s better.F8DE9161-3D58-4707-B007-B552FC0CC63F.thumb.jpeg.c9302b33d3d3593948a56521d1c1e28a.jpegF8DE9161-3D58-4707-B007-B552FC0CC63F.thumb.jpeg.c9302b33d3d3593948a56521d1c1e28a.jpeg

CA629291-B423-4E91-9B44-25AFE5ACCA43.jpeg

74577D1D-E607-432F-B30F-CC766C88EECB.jpeg

 

CED7DB21-F7C4-4EDC-B1A7-6FD2CA764F9A.jpeg

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Ludwigia

Sorry, but I still can't see the coral.

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pictures are fine, but I have to agree... nice geode, but there is no horn coral.  

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Susan Slater

I’m so sorry the pictures are not suitable, but if you could see the geode In person you can easily see it is a horned coral in the center of the geode with a crystal on top of half fossil in one side of the geode. The geode is just an ordinary chalcedony geode and is nothing special.  It is an exceptional fossil. I understand why you can’t see it. The pictures don’t do it justice. Sue

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This is an agate nodule, they form when a cavity in rock has silica build up on its walls. They form deep in the Earth because of silica rich liquids which deposit the mineral in the nodule.

It's extremely unlikely that a horn coral would somehow end up in the cavity of a volcanic rock, not dissolve due to the great heat of the liquids carrying the silica, and on top of that even if all of that were to happen, the nodule forms from the outside in, meaning that even if it did survive the horn coral would be buried inside the actual agate along the walls of the nodule, not in the center cavity of it. It is pretty much impossible for a horn coral to get into this position in a nodule like this, this is definitely a crystal formation and not a fossil.

 

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