sedimentary
Brain Coral Fossil
Family Mussidae or Merulinidae (Order Scleractinia)
AI-generated identification · may be incorrectHardness: 3.0-4.0 (Mohs scale), Color: Cream, tan, or grey, Luster: Dull/earthy, Structure: Meandroid (wandering ridges and valleys), Composition: Calcium carbonate/Aragonite
- Hardness
- 3
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Physical properties
Hardness: 3.0-4.0 (Mohs scale), Color: Cream, tan, or grey, Luster: Dull/earthy, Structure: Meandroid (wandering ridges and valleys), Composition: Calcium carbonate/Aragonite
Formation & geological history
Formed by the accumulation of coral polyps secreting calcium carbonate skeletons in warm, shallow marine environments. Over time, these remain become lithified into fossiliferous limestone.
Uses & applications
Used primarily for ornamental decoration, aquarium landscaping, and as educational geological specimens. In ground form, limestone from such origins provides lime for cement and agriculture.
Geological facts
The name 'brain coral' comes from the resemblance of the colony's surface corrugated ridges to the cerebral cortex of a human brain. These organisms are major reef builders.
Field identification & locations
Identify by a pattern of winding ridges (septa) and grooves. Commonly found in coastal sedimentary deposits and uplifted ancient reefs such as the Florida Keys or tropical island regions worldwide.
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