Found this on the Beach in Florida

[TheRake71]

I found this on the beach in Florida, it is solid, like rock and shell, but makes no sense to me. It's not loose anywhere, and there's no separating any part of it, but it's clearly 2 different types of material. I was wondering if anyone has seen anything like it, or possibly knows what it could be? Thanks!

 

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[Tony in SC]

Water worn granite/quartz ?

 

[TheRake71]

the gray does have some shiny specs in it, but the beige seems more shell like than rock, but it can't be shell, it's very odd.

 

[Hunk-a-lead]

looks to me like a wave worn spiral shell

 

[TheRake71]

looks to me like a wave worn spiral shell

the thing is that both materials are fused together. there is no way to separate them, it is a solid piece. i thought if it were shell and rock, that it would be loose, or be able to come apart. it is the craziest "rock" I have ever seen, and it's been driving me nuts for weeks!

 

[Rmeav8r]

Looks like it might be Coquina, or Tabby an early building material for mortar and cement used in Florida back at least 300 years. As a building material, coquina is lightweight, easy to find (it’s indigenous to the Florida coast), easy to use, and nearly indestructible. Not only is coquina bullet-proof, it is virtually cannon-ball- proof! The fort at St. Augustine is a great example. Coquina is natural, Tabby is man made.

https://oceanservice.noaa.gov/facts/coquina-tabby.html

the thing is that both materials are fused together. there is no way to separate them, it is a solid piece. i thought if it were shell and rock, that it would be loose, or be able to come apart. it is the craziest "rock" I have ever seen, and it's been driving me nuts for weeks!

 

[invent4hir]

The 3rd picture looks like there is a seam and some smaller spots of quartz or whatever that lighter colored material is embedded. Curious indeed. Consider showing it to a geologist or moving to the rocks forum.

 

[Seakur]

I found this on the beach in Florida, it is solid, like rock and shell, but makes no sense to me. It's not loose anywhere, and there's no separating any part of it, but it's clearly 2 different types of material. I was wondering if anyone has seen anything like it, or possibly knows what it could be? Thanks!

It looks like a piece of carved abalone shell. Nice!

 

[unclemac]

I have a number of marine fossils that still are partially shell, not uncommon.

 

[GoldieLocks]

The shell part is likely calcium.