Rock Identifier
Fossilized Gastropod Shell (Gastropoda (Fossilized internal mold or shell body)) — fossil
fossil

Fossilized Gastropod Shell

Gastropoda (Fossilized internal mold or shell body)

AI-generated identification · may be incorrect

Hardness: ~3-7 on Mohs scale depending on permineralization matrix (calcite or silica). Color: Brownish-gray, tan, beige with a smooth, rounded water-worn appearance. Luster: Dull to vitreous/smooth. Structure: Spiral or elongate conical coiled geometry characteristic of sea snails or land snails.

Luster
Dull to vitreous/smooth
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Physical properties

Hardness: ~3-7 on Mohs scale depending on permineralization matrix (calcite or silica). Color: Brownish-gray, tan, beige with a smooth, rounded water-worn appearance. Luster: Dull to vitreous/smooth. Structure: Spiral or elongate conical coiled geometry characteristic of sea snails or land snails.

Formation & geological history

Formed when a gastropod (snail) shell was buried in sediment millions of years ago. Mineral-rich groundwater seeped into the shell or replaced the original calcium carbonate material with microcrystalline quartz or silica through petrifaction or created a cast/mold.

Uses & applications

Popular as decorative objects, educational tools for paleontology, additions to amateur fossil collections, and for crafting.

Geological facts

Gastropods are one of the most successful groups of organisms on Earth, appearing in the fossil record as early as the Cambrian period (over 500 million years ago) and continuing to thrive today.

Field identification & locations

Identified by its elongated, coiled, or rounded conical shape resembling modern sea snails or land snails, often smoothed by water erosion in riverbeds or beaches. Commonly found in sedimentary rock layers, ancient riverbeds, and coastal areas worldwide.

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