fossil

Starfish Fossil

Asteroidea fossil

Hardness varies depending on mineralization (typically Mohs 3-4 for calcite replacements), colors range from brown to grey, luster is dull to earthy, preservation of external skeletal plates (ossicles).

Identified August 2, 2026More fossil →

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Physical properties

Formation & geological history

Formed through the rapid burial of a starfish in fine-grained marine sediment, followed by permineralization where organic material is replaced by minerals like calcite or silica over millions of years.

Uses & applications

Used in educational exhibits, scientific research on prehistoric marine ecosystems, and as decorative collector items.

Geological facts

Starfish fossils are relatively rare compared to other echinoderms like crinoids because their bodies are composed of loosely connected plates that typically disintegrate quickly after death.