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Post by hannaheself on Jul 24, 2007 9:15:47 GMT -5
Here's something I found on the beach in North Carolina:  Does anyone know what it is or how it was formed? It's about 5" x 7" or so. |
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Post by DigDug on Jul 24, 2007 10:32:37 GMT -5
Looks like Old Coral, we found a bunch at Myrtle and put it in our saltwater aquarium
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fayncfaceter
Senior Member
Portuguese cut in synthetic Citrine
Posts: 92
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Post by fayncfaceter on Jul 28, 2007 18:35:11 GMT -5
It also looks like the coquina that you can collect off the shore at Ft. Fisher. Either way, I vote for Limestone of some sort.
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Post by downeast on Mar 28, 2008 19:47:31 GMT -5
This is a moldic limestone. The fossils (Aragonitic shell material) have been leached out and has left just the lime mud (Calcite). There is probably some small calcite crystals lining the cavities. Probably from one of the local Tertiary limestones from SC. Put some acid (weak hydrochloric (10%)) and see if it fizzes. Limestone (calcite) will fizz.
Downeast
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