Rock Identifier
Seashell Fossil (Invertebrate Bivalve / Gastropod Fossil (Calcium Carbonate, CaCO3)) — fossil
fossil

Seashell Fossil

Invertebrate Bivalve / Gastropod Fossil (Calcium Carbonate, CaCO3)

AI-generated identification · may be incorrect

Hardness of 3-4 on the Mohs scale, typically white or cream colored with radial ribs, vitreous to dull luster, composed of aragonite or calcite crystal structure.

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Physical properties

Hardness of 3-4 on the Mohs scale, typically white or cream colored with radial ribs, vitreous to dull luster, composed of aragonite or calcite crystal structure.

Formation & geological history

Formed through the accumulation and fossilization of marine mollusk shells in sedimentary environments over millions of years.

Uses & applications

Used in decorative items, shell collecting, educational displays, and as indicators of paleoenvironments in geology.

Geological facts

Fossilized shells provide crucial evidence of ancient marine ecosystems and sea-level changes throughout Earth's history.

Field identification & locations

Found worldwide in sedimentary rock layers, particularly in limestone and shale deposits; easily identified by distinct exterior growth ribs and natural shell shape.

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Probable fossil-bearing rock or mineral concretion (Unidentified carbonate-rich concretion with a possible fossil inclusion) — fossil

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

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Likely fossil oyster shell (Fossilized bivalve shell; exact species cannot be identified from the image) — fossil

Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

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Crinoid Stem Fossil in Matrix (Phylum Echinodermata, Class Crinoidea) — fossil

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

fossil
Fossiliferous limestone (likely a crinoidal or shell-fragment limestone) (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

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

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

sedimentary
Rounded sedimentary pebble (Likely micritic limestone or calcareous sandstone) — sedimentary

Rounded sedimentary pebble

Likely micritic limestone or calcareous sandstone

sedimentary
Chert with Fossil Brachiopod (Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion) — sedimentary

Chert with Fossil Brachiopod

Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion

sedimentary