Rock Identifier
Fossil Coral (Scleractinia (Stony Coral) fossil) — fossil
fossil

Fossil Coral

Scleractinia (Stony Coral) fossil

AI-generated identification · may be incorrect

Hardness: 3-4 on the Mohs scale; Color: White, cream, gray, with occasional pink or brownish hues; Luster: Dull to vitreous; Crystal structure: Orthorhombic or trigonal (aragonite/calcite); Cleavage: Distinct in calcite; Specific gravity: 2.6-2.8

Hardness
3-4 on the Mohs scale
Color
White, cream, gray, with occasional pink or brownish hues
Luster
Dull to vitreous
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Physical properties

Hardness: 3-4 on the Mohs scale; Color: White, cream, gray, with occasional pink or brownish hues; Luster: Dull to vitreous; Crystal structure: Orthorhombic or trigonal (aragonite/calcite); Cleavage: Distinct in calcite; Specific gravity: 2.6-2.8

Formation & geological history

Formed through the accumulation and fossilization of marine invertebrate skeletons (coral polyps) made of calcium carbonate, preserved in sedimentary rock layers over thousands to millions of years.

Uses & applications

Used in ornamental carvings, jewelry making, educational displays, and as a popular specimen for fossil collectors.

Geological facts

Fossil corals can preserve intricate internal skeletal structures down to the microscopic level, offering scientists a detailed window into ancient marine ecosystems and prehistoric climates.

Field identification & locations

Easily identified by its characteristic honeycomb, tubular, or branching pore patterns on the surface. Commonly found in ancient marine limestone formations worldwide, especially in shallow tropical paleo-environments.

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