Rock Identifier
Seashell Fossil (Mollusca fossil) — fossil
fossil

Seashell Fossil

Mollusca fossil

AI-generated identification · may be incorrect

Hardness varies from 3 to 4 on the Mohs scale depending on mineralization, predominantly off-white or tan, with a dull to vitreous luster. Preserves the original spiral morphology and spiral whorls of marine gastropods.

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Physical properties

Hardness varies from 3 to 4 on the Mohs scale depending on mineralization, predominantly off-white or tan, with a dull to vitreous luster. Preserves the original spiral morphology and spiral whorls of marine gastropods.

Formation & geological history

Formed through permineralization where organic calcium carbonate shells are replaced by minerals like silica or calcite over thousands to millions of years.

Uses & applications

Used in educational displays, decorative items, and fossil collecting.

Geological facts

Many fossilized shells retain fine structural details of ancient marine ecosystems dating back millions of years.

Field identification & locations

Identified by spiral whorls and calcareous or silicated matrix; commonly found in sedimentary limestone and coastal fossil beds.

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Crinoid Stem Fossil in Matrix

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

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Porous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

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Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

fossil