fossil

Fossilized Coral (Favosites)

Favosites goldfussi

Hardness: 3-4 (calcite-based); Color: Tan, brown, and white; Luster: Dull to earthy; Structure: Honeycomb-like or tubular septa visible on the surface; Specific Gravity: 2.7

Hardness: 3-4 (calcite-based)
Color: Tan, brown, and white
Luster: Dull to earthy

Identified July 5, 2026More fossil →

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Physical properties

Hardness: 3-4 (calcite-based); Color: Tan, brown, and white; Luster: Dull to earthy; Structure: Honeycomb-like or tubular septa visible on the surface; Specific Gravity: 2.7

Formation & geological history

Formed in warm, shallow marine environments during the Silurian to Devonian periods (approx. 400 million years ago) through the permineralization of ancient coral colonies.

Uses & applications

Primarily used for educational purposes, scientific study, and as decorative collector pieces or aquarium decor.

Geological facts

Known as 'Honeycomb Coral' because of its distinct hexagonal appearance when viewed from above. These corals are extinct and were colonial organisms that built massive reefs.

Field identification & locations

Identify by looking for repeating geometric or 'tube' patterns on the surface of a limestone-like matrix. Commonly found in the Great Lakes region (USA) and diverse eroded sedimentary basins.