Where is Fossilized Coral Agate found?
Chalcedony (pseudomorph after coral)
Got a photo? Identify rocks instantly with the Rockby app
Open the appFossilized Coral Agate occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Fossilized Coral Agate
Florida, USA
Known for its 'Agatized Coral' (specifically the 'Florida State Stone'), primarily found in the Tampa Bay area and along the Gulf Coast. These are typically Miocene to Pliocene in age.
Indonesia (especially Sumatra)
Produces a wide variety of fossilized corals, often with vibrant colors and intricate patterns, from various geological periods.
Morocco
Known for fossiliferous deposits, including silicified corals, often found in sedimentary layers.
Utah, USA
Some occurrences of fossilized coral have been reported, though less common than in Florida.
Australia
Various locations yield fossilized corals, particularly from ancient reef systems.
Collecting tips
- Look in Sedimentary Deposits. Focus on areas with ancient marine sedimentary rocks, particularly those known for fossiliferous limestone or silicified reef structures. Riverbeds and gravel pits in such regions can also yield specimens.
- Identify Coral Structures. The key to identifying fossilized coral agate is the presence of preserved coral patterns. Look for radial septa, hexagonal or circular corallites, and other characteristic coral morphologies within the chalcedony.
- Check for Hardness. Since it's primarily chalcedony, it will be relatively hard (Mohs 6.5-7). This can help distinguish it from softer carbonate fossils.
- Observe Luster and Fracture. The waxy to dull luster and conchoidal fracture are characteristic of chalcedony. Freshly broken surfaces may reveal a more vitreous sheen.
Quick Check
- Color:
- Varied, often with visible coral patterns
- Luster:
- Waxy to dull
- Streak:
- White
Explore Fossilized Coral Agate
Identify rocks anywhere
Free on iOS, Android, and Web. Photo identification, full database, and your personal collection.