sedimentary
Fossil Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness: 3-4 (Mohs scale), Color: Cream, tan, or white, Luster: Dull to earthy, Structure: Visible coralline pores or septa, Cleavage: None
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Physical properties
Hardness: 3-4 (Mohs scale), Color: Cream, tan, or white, Luster: Dull to earthy, Structure: Visible coralline pores or septa, Cleavage: None
Formation & geological history
Formed from the skeletal remains of marine polyps in shallow tropical seas, typically during the Paleozoic or Mesozoic eras, later lithified into limestone.
Uses & applications
Used for geological study, decorative aquarium decor, jewelry (petrified versions), and as a calcium source in industry.
Geological facts
Agatized coral is the state rock of Florida; these fossils can be millions of years old and represent ancient reef systems that are now on dry land due to sea-level changes.
Field identification & locations
Look for small, repeated geometric holes (calices) or star-like patterns on the surface of a light-colored rock. Common in limestone quarries and coastal regions.
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