fossil
Favosites Fossil (Honeycomb Coral)
Favosites alpenensis
Hardness: 3-4 (Calcite), Color: Light gray, tan, or white, Luster: Dull to waxy, Structure: Hexagonal honeycombed coral chambers (corallites), Specific Gravity: ~2.7
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Physical properties
Hardness: 3-4 (Calcite), Color: Light gray, tan, or white, Luster: Dull to waxy, Structure: Hexagonal honeycombed coral chambers (corallites), Specific Gravity: ~2.7
Formation & geological history
Formed from the calcium carbonate skeletons of colonial corals during the Silurian and Devonian periods (approx. 360-420 million years ago) in warm, shallow marine environments.
Uses & applications
Scientific study, educational specimens, lapidary use (cabochons), and decorative collectibles.
Geological facts
Commonly known as Honeycomb Coral due to their distinctive grid-like appearance, these were extinct tabulate corals that lived in colonies and helped form ancient reefs.
Field identification & locations
Look for a pebble with a visible mesh or grid pattern of small holes. They are frequently found as water-worn pebbles on the beaches of the Great Lakes, particularly Lake Michigan.
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