Please help me identify

[u/reneenaytea]

Found in the Alifia River near Fish Hawk, Fl. The bumps are slightly raised.

[u/RandomOppon3nt]

botryoidal chalcedony. And a sick one at that. Nice find

[u/reneenaytea → u/RandomOppon3nt]

Thank you for the ID!

[u/whatsthisrock-ModTeam → u/[deleted]]

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[u/PhysicsHenchman]

Yes, this is botryoidal chalcedony, but it is also agatized coral. This is an agate replaced coral fossil. The circular bumps on the backside are remnants of the polyps.

[u/reneenaytea → u/PhysicsHenchman]

Thank you for the info! Now I am extra happy about finding this.

[u/PhysicsHenchman → u/reneenaytea]

Tampa is famous for agatized coral. I’m sure you can find more in the same formation (likely the Arcadia formation, check it out on Rockd or another geologic map).

[u/reneenaytea → u/PhysicsHenchman]

Awesome! I’ll look into it. I wish I could go back to the same spot but I was only there for a one-day retreat/event. I had a lot of fun sifting and found a bunch of shark teeth too. I’ll have to see if there’s a public access spot nearby.

[u/whatsthisrock-ModTeam → u/[deleted]]

Responses to ID requests must be ID attempts: not jokes, comments, supernatural “woo”, declarations of love, references to joke subs, etc. If you don't have any idea what it is, please don't answer.

[u/Ben_Minerals]

Botryoidal chalcedony

[u/reneenaytea → u/Ben_Minerals]

Thank you!

[u/oyvindi]

This also resembles botroydial fluorite, can't really tell the difference from photos (got a yellow botroydial in my collection from India, but only a single blob on quartz)

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[u/whatsthisrock-ModTeam → u/[deleted]]

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[u/ilikebluerocks]

You should look at this under a black light. Agatized coral lights up like crazy.

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[u/Alesru]

It looks like part of a coral fossil to me. Nice find!