Agatized Coral
Fossil Anthozoa
Markings and exact colorations may vary.
Fossil coral replaced by silica, showing crystal-lined pockets and a stony flower pattern. Florida's state stone.
- Typical size
- 1–6 in
- How often it turns up
- Uncommon
- Collecting
- Check local rules
- Handling
- Safe to handle
Collecting from private land needs permission, and river or state-land collecting may need a permit. Beach finds are usually fine.
How to tell it apart
- Coral polyp pattern visible on the surface
- Hollow pockets lined with quartz crystals
- Very hard, takes a polish
Where to find these in Florida
Beaches rated very good or excellent for fossils. Each page shows today’s score, the best window and access details.
- Caspersen Beach · Venice
- Englewood Beach (Chadwick Park) · Englewood
- Stump Pass Beach State Park · Englewood
- Turner Beach · Captiva
- Turtle Beach · Siesta Key
Found one?
Photograph it and BeachNut ranks the likely matches with a confidence read, then logs it to your collection with the beach and date.
Browsing beaches and the full field guide is free. A free account logs unlimited finds and gives you three photo identifications a day.
More fossils in the field guide
Get Florida beachcombing tips
Occasional emails: what's washing up, shelling tips and new BeachNut features. No spam, unsubscribe any time.