Coquina Rock
Cemented shell limestone
Markings and exact colorations may vary.
Rock made entirely of cemented shell fragments, the stone Florida's oldest forts were cut from.
- Typical size
- Any size
- How often it turns up
- Common near outcrops
- Collecting
- Check local rules
- Handling
- Safe to handle
Loose beach pieces are usually fine. Do not break stone from outcrops — most are inside parks or protected shoreline.
How to tell it apart
- Visible whole and broken shells cemented together
- Light, porous, crumbly at the edges
- Cream to grey
Where to find these in Florida
Beaches rated very good or excellent for rocks. Each page shows today’s score, the best window and access details.
- Big Talbot Island Boneyard Beach · Jacksonville
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 rocks 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.